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36=4a+8a
We move all terms to the left:
36-(4a+8a)=0
We add all the numbers together, and all the variables
-(+12a)+36=0
We get rid of parentheses
-12a+36=0
We move all terms containing a to the left, all other terms to the right
-12a=-36
a=-36/-12
a=+3
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