document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=417575>Question 417575</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I need some help with deciding if the given number is a solution to the given equation and I am not sure how to know.\r<BR>\n" );
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document.write( "3x +7 = 21;  4\r<BR>\n" );
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document.write( "Thanks :O) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #292337 by </B><A HREF=/tutors/aboutme.mpl?userid=marcovan><B>marcovan(4)</B></A><img src=\"/images/stars/iconNewId_16x16.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=marcovan><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=292337\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 3x+7=21\r<BR>\n" );
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document.write( "Isolate variable by subtracting 7 from both sides\r<BR>\n" );
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document.write( "3x+7=21<BR>\n" );
document.write( "  -7=-7\r<BR>\n" );
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document.write( "3x=14\r<BR>\n" );
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document.write( "divide both sides by 3\r<BR>\n" );
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document.write( "3x/3=14/3\r<BR>\n" );
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document.write( "x=14/3  therefore 4 is not a solution\r<BR>\n" );
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document.write( "check:\r<BR>\n" );
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document.write( "3(4)+7=21<BR>\n" );
document.write( "12+7=21<BR>\n" );
document.write( "19 does not equal 21 so therefore 4 is not a solution\r<BR>\n" );
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