document.write( "Question 687789: Please help me solve for the variable..show all work.. and please show me how to check this problem. (3/a+1) = (5/a+7) \n" ); document.write( "
Algebra.Com's Answer #425346 by ReadingBoosters(3246)\"\" \"About 
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Cross Multiply
\n" ); document.write( "3(a+7) = 5(a+1)
\n" ); document.write( "Distribute the 3 and the 5
\n" ); document.write( "3a + 21 = 5a + 5
\n" ); document.write( "Group like terms
\n" ); document.write( "3a - 5a = 5 - 21
\n" ); document.write( "Combine like terms
\n" ); document.write( "-2a = -16
\n" ); document.write( "Divide both sides by -2 to isolate the variable
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