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-3(f-7)+3=39
We move all terms to the left:
-3(f-7)+3-(39)=0
We add all the numbers together, and all the variables
-3(f-7)-36=0
We multiply parentheses
-3f+21-36=0
We add all the numbers together, and all the variables
-3f-15=0
We move all terms containing f to the left, all other terms to the right
-3f=15
f=15/-3
f=-5
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