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2(4f+2)=-20
We move all terms to the left:
2(4f+2)-(-20)=0
We add all the numbers together, and all the variables
2(4f+2)+20=0
We multiply parentheses
8f+4+20=0
We add all the numbers together, and all the variables
8f+24=0
We move all terms containing f to the left, all other terms to the right
8f=-24
f=-24/8
f=-3
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