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5f+2(f+3)=10
We move all terms to the left:
5f+2(f+3)-(10)=0
We multiply parentheses
5f+2f+6-10=0
We add all the numbers together, and all the variables
7f-4=0
We move all terms containing f to the left, all other terms to the right
7f=4
f=4/7
f=4/7
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