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12=0.5a
We move all terms to the left:
12-(0.5a)=0
We add all the numbers together, and all the variables
-(+0.5a)+12=0
We get rid of parentheses
-0.5a+12=0
We move all terms containing a to the left, all other terms to the right
-0.5a=-12
a=-12/-0.5
a=+24
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