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42=36+f
We move all terms to the left:
42-(36+f)=0
We add all the numbers together, and all the variables
-(f+36)+42=0
We get rid of parentheses
-f-36+42=0
We add all the numbers together, and all the variables
-1f+6=0
We move all terms containing f to the left, all other terms to the right
-f=-6
f=-6/-1
f=+6
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