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4a-5(3a+2)=12
We move all terms to the left:
4a-5(3a+2)-(12)=0
We multiply parentheses
4a-15a-10-12=0
We add all the numbers together, and all the variables
-11a-22=0
We move all terms containing a to the left, all other terms to the right
-11a=22
a=22/-11
a=-2
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