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36=40-2f
We move all terms to the left:
36-(40-2f)=0
We add all the numbers together, and all the variables
-(-2f+40)+36=0
We get rid of parentheses
2f-40+36=0
We add all the numbers together, and all the variables
2f-4=0
We move all terms containing f to the left, all other terms to the right
2f=4
f=4/2
f=2
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