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36=0.3a+12
We move all terms to the left:
36-(0.3a+12)=0
We get rid of parentheses
-0.3a-12+36=0
We add all the numbers together, and all the variables
-0.3a+24=0
We move all terms containing a to the left, all other terms to the right
-0.3a=-24
a=-24/-0.3
a=+80
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