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-9+8(f+2)=21
We move all terms to the left:
-9+8(f+2)-(21)=0
We add all the numbers together, and all the variables
8(f+2)-30=0
We multiply parentheses
8f+16-30=0
We add all the numbers together, and all the variables
8f-14=0
We move all terms containing f to the left, all other terms to the right
8f=14
f=14/8
f=1+3/4
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