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(-3)(8-f)=18
We move all terms to the left:
(-3)(8-f)-(18)=0
We add all the numbers together, and all the variables
(-3)(-1f+8)-18=0
We multiply parentheses ..
(+3f-24)-18=0
We add all the numbers together, and all the variables
(3f-24)-18=0
We get rid of parentheses
3f-24-18=0
We add all the numbers together, and all the variables
3f-42=0
We move all terms containing f to the left, all other terms to the right
3f=42
f=42/3
f=14
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