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20=4(f+1)
We move all terms to the left:
20-(4(f+1))=0
We calculate terms in parentheses: -(4(f+1)), so:We get rid of parentheses
4(f+1)
We multiply parentheses
4f+4
Back to the equation:
-(4f+4)
-4f-4+20=0
We add all the numbers together, and all the variables
-4f+16=0
We move all terms containing f to the left, all other terms to the right
-4f=-16
f=-16/-4
f=+4
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