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-3a+18+7a=2a-4a
We move all terms to the left:
-3a+18+7a-(2a-4a)=0
We add all the numbers together, and all the variables
-3a+7a-(-2a)+18=0
We add all the numbers together, and all the variables
4a-(-2a)+18=0
We get rid of parentheses
4a+2a+18=0
We add all the numbers together, and all the variables
6a+18=0
We move all terms containing a to the left, all other terms to the right
6a=-18
a=-18/6
a=-3
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