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18-15f+15f=-17-5f
We move all terms to the left:
18-15f+15f-(-17-5f)=0
We add all the numbers together, and all the variables
-15f+15f-(-5f-17)+18=0
We add all the numbers together, and all the variables
-(-5f-17)+18=0
We get rid of parentheses
5f+17+18=0
We add all the numbers together, and all the variables
5f+35=0
We move all terms containing f to the left, all other terms to the right
5f=-35
f=-35/5
f=-7
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