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7(4-f)=-84
We move all terms to the left:
7(4-f)-(-84)=0
We add all the numbers together, and all the variables
7(-1f+4)-(-84)=0
We add all the numbers together, and all the variables
7(-1f+4)+84=0
We multiply parentheses
-7f+28+84=0
We add all the numbers together, and all the variables
-7f+112=0
We move all terms containing f to the left, all other terms to the right
-7f=-112
f=-112/-7
f=+16
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