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-3=2(f-13)-13
We move all terms to the left:
-3-(2(f-13)-13)=0
We calculate terms in parentheses: -(2(f-13)-13), so:We get rid of parentheses
2(f-13)-13
We multiply parentheses
2f-26-13
We add all the numbers together, and all the variables
2f-39
Back to the equation:
-(2f-39)
-2f+39-3=0
We add all the numbers together, and all the variables
-2f+36=0
We move all terms containing f to the left, all other terms to the right
-2f=-36
f=-36/-2
f=+18
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