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-6(-9-3f)=216
We move all terms to the left:
-6(-9-3f)-(216)=0
We add all the numbers together, and all the variables
-6(-3f-9)-216=0
We multiply parentheses
18f+54-216=0
We add all the numbers together, and all the variables
18f-162=0
We move all terms containing f to the left, all other terms to the right
18f=162
f=162/18
f=9
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