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