Posted by randy on Tuesday, October 4, 2011 at 1:05am.
3(a+4)/9 = 2a - 12
cancel down the 3/9
(a+4)/3 = 2a - 12
multiply through by 3
a+4 = 6a - 36
add 36 to both sides
a+40=6a
subtract a from both sides
40 = 5a
divide both sides by 5
8=a
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