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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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