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2(2a+3)-2a-12=18
We move all terms to the left:
2(2a+3)-2a-12-(18)=0
We add all the numbers together, and all the variables
-2a+2(2a+3)-30=0
We multiply parentheses
-2a+4a+6-30=0
We add all the numbers together, and all the variables
2a-24=0
We move all terms containing a to the left, all other terms to the right
2a=24
a=24/2
a=12
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