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-4(f-3)=-8
We move all terms to the left:
-4(f-3)-(-8)=0
We add all the numbers together, and all the variables
-4(f-3)+8=0
We multiply parentheses
-4f+12+8=0
We add all the numbers together, and all the variables
-4f+20=0
We move all terms containing f to the left, all other terms to the right
-4f=-20
f=-20/-4
f=+5
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