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2(f+2)-5=7
We move all terms to the left:
2(f+2)-5-(7)=0
We add all the numbers together, and all the variables
2(f+2)-12=0
We multiply parentheses
2f+4-12=0
We add all the numbers together, and all the variables
2f-8=0
We move all terms containing f to the left, all other terms to the right
2f=8
f=8/2
f=4
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