document.write( "Question 102799: The sum of a number and –7 is -12. Find the number. \n" ); document.write( "
Algebra.Com's Answer #74763 by doukungfoo(195)\"\" \"About 
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lets call the number x
\n" ); document.write( "we are told that the sum of a number and -7 is -12
\n" ); document.write( "write an equation
\n" ); document.write( "x + (-7) = -12
\n" ); document.write( "x - 7 = -12
\n" ); document.write( "solve for x by adding 7 to both sides
\n" ); document.write( "x - 7 + 7 = -12 + 7
\n" ); document.write( "The sevens on the left side cancel out
\n" ); document.write( "x = -12 + 7
\n" ); document.write( "x = -5
\n" ); document.write( "Answer: The number is -5
\n" ); document.write( "Check by replacing x in the original equation with -5
\n" ); document.write( "x + (-7) = -12
\n" ); document.write( "-5 + (-7) = -12
\n" ); document.write( "-12 = -12
\n" ); document.write( " \n" ); document.write( "
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