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-64=-4(f-2)
We move all terms to the left:
-64-(-4(f-2))=0
We calculate terms in parentheses: -(-4(f-2)), so:We get rid of parentheses
-4(f-2)
We multiply parentheses
-4f+8
Back to the equation:
-(-4f+8)
4f-8-64=0
We add all the numbers together, and all the variables
4f-72=0
We move all terms containing f to the left, all other terms to the right
4f=72
f=72/4
f=18
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