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3(2a+3)-4(3a-24)=15
We move all terms to the left:
3(2a+3)-4(3a-24)-(15)=0
We multiply parentheses
6a-12a+9+96-15=0
We add all the numbers together, and all the variables
-6a+90=0
We move all terms containing a to the left, all other terms to the right
-6a=-90
a=-90/-6
a=+15
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