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36=4f+12
We move all terms to the left:
36-(4f+12)=0
We get rid of parentheses
-4f-12+36=0
We add all the numbers together, and all the variables
-4f+24=0
We move all terms containing f to the left, all other terms to the right
-4f=-24
f=-24/-4
f=+6
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