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7f=2f-35
We move all terms to the left:
7f-(2f-35)=0
We get rid of parentheses
7f-2f+35=0
We add all the numbers together, and all the variables
5f+35=0
We move all terms containing f to the left, all other terms to the right
5f=-35
f=-35/5
f=-7
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