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5f+3=2f-7
We move all terms to the left:
5f+3-(2f-7)=0
We get rid of parentheses
5f-2f+7+3=0
We add all the numbers together, and all the variables
3f+10=0
We move all terms containing f to the left, all other terms to the right
3f=-10
f=-10/3
f=-3+1/3
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