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12=4(f-13)
We move all terms to the left:
12-(4(f-13))=0
We calculate terms in parentheses: -(4(f-13)), so:We get rid of parentheses
4(f-13)
We multiply parentheses
4f-52
Back to the equation:
-(4f-52)
-4f+52+12=0
We add all the numbers together, and all the variables
-4f+64=0
We move all terms containing f to the left, all other terms to the right
-4f=-64
f=-64/-4
f=+16
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