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-36=-3(f-78)
We move all terms to the left:
-36-(-3(f-78))=0
We calculate terms in parentheses: -(-3(f-78)), so:We get rid of parentheses
-3(f-78)
We multiply parentheses
-3f+234
Back to the equation:
-(-3f+234)
3f-234-36=0
We add all the numbers together, and all the variables
3f-270=0
We move all terms containing f to the left, all other terms to the right
3f=270
f=270/3
f=90
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