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6+3(4a-3)=12+5a
We move all terms to the left:
6+3(4a-3)-(12+5a)=0
We add all the numbers together, and all the variables
3(4a-3)-(5a+12)+6=0
We multiply parentheses
12a-(5a+12)-9+6=0
We get rid of parentheses
12a-5a-12-9+6=0
We add all the numbers together, and all the variables
7a-15=0
We move all terms containing a to the left, all other terms to the right
7a=15
a=15/7
a=2+1/7
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