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80=5(f+3)
We move all terms to the left:
80-(5(f+3))=0
We calculate terms in parentheses: -(5(f+3)), so:We get rid of parentheses
5(f+3)
We multiply parentheses
5f+15
Back to the equation:
-(5f+15)
-5f-15+80=0
We add all the numbers together, and all the variables
-5f+65=0
We move all terms containing f to the left, all other terms to the right
-5f=-65
f=-65/-5
f=+13
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