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