document.write( "Question 987534: what is the way to solve 3(x+21)=-4(x-21) \n" ); document.write( "

Algebra.Com's Answer #608282 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"+3%2A%28+x+%2B+21+%29++=+-4%2A%28+x+-+21+%29+\"$
\n" ); document.write( "Use distributive law which says:
\n" ); document.write( " $\"+a%2A%28+b+%2B+c+%29+=+a%2Ab+%2B+a%2Ac+\"$
\n" ); document.write( "---------------------------
\n" ); document.write( " $\"+3x+%2B+63+=+-4x+%2B+84+\"$
\n" ); document.write( "Add $\"+4x+\"$ to both sides
\n" ); document.write( " $\"+7x+%2B+63+=+84+\"$
\n" ); document.write( "Subtract $\"+63+\"$ from both sides
\n" ); document.write( " $\"+7x+=+21+\"$
\n" ); document.write( "Divide both sides by $\"+7+\"$
\n" ); document.write( " $\"+x+=+3+\"$
\n" ); document.write( "--------------
\n" ); document.write( "check solution:
\n" ); document.write( " $\"+3%2A%28+3+%2B+21+%29++=+-4%2A%28+3+-+21+%29+\"$
\n" ); document.write( " $\"+3%2A24+=+-4%2A%28+-18+%29+\"$
\n" ); document.write( "Divide both sides by $\"+6+\"$
\n" ); document.write( " $\"+3%2A4+=+-4%2A%28+3+%29+\"$
\n" ); document.write( " $\"+12+=+12+\"$
\n" ); document.write( "OK \n" ); document.write( "

\n" );