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2(f+10)=-20
We move all terms to the left:
2(f+10)-(-20)=0
We add all the numbers together, and all the variables
2(f+10)+20=0
We multiply parentheses
2f+20+20=0
We add all the numbers together, and all the variables
2f+40=0
We move all terms containing f to the left, all other terms to the right
2f=-40
f=-40/2
f=-20
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