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56=-7(f+12)
We move all terms to the left:
56-(-7(f+12))=0
We calculate terms in parentheses: -(-7(f+12)), so:We get rid of parentheses
-7(f+12)
We multiply parentheses
-7f-84
Back to the equation:
-(-7f-84)
7f+84+56=0
We add all the numbers together, and all the variables
7f+140=0
We move all terms containing f to the left, all other terms to the right
7f=-140
f=-140/7
f=-20
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