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7-8a=-2a-a-4a
We move all terms to the left:
7-8a-(-2a-a-4a)=0
We add all the numbers together, and all the variables
-8a-(-7a)+7=0
We get rid of parentheses
-8a+7a+7=0
We add all the numbers together, and all the variables
-1a+7=0
We move all terms containing a to the left, all other terms to the right
-a=-7
a=-7/-1
a=+7
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