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4-(-3a)=8
We move all terms to the left:
4-(-3a)-(8)=0
We add all the numbers together, and all the variables
-(-3a)-4=0
We get rid of parentheses
3a-4=0
We move all terms containing a to the left, all other terms to the right
3a=4
a=4/3
a=1+1/3
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