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12=0.25a
We move all terms to the left:
12-(0.25a)=0
We add all the numbers together, and all the variables
-(+0.25a)+12=0
We get rid of parentheses
-0.25a+12=0
We move all terms containing a to the left, all other terms to the right
-0.25a=-12
a=-12/-0.25
a=+48
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