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-18+17f-3=15+20f
We move all terms to the left:
-18+17f-3-(15+20f)=0
We add all the numbers together, and all the variables
17f-(20f+15)-18-3=0
We add all the numbers together, and all the variables
17f-(20f+15)-21=0
We get rid of parentheses
17f-20f-15-21=0
We add all the numbers together, and all the variables
-3f-36=0
We move all terms containing f to the left, all other terms to the right
-3f=36
f=36/-3
f=-12
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