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6f-4+7-f=f-18-3f
We move all terms to the left:
6f-4+7-f-(f-18-3f)=0
We add all the numbers together, and all the variables
6f-f-(-2f-18)-4+7=0
We add all the numbers together, and all the variables
5f-(-2f-18)+3=0
We get rid of parentheses
5f+2f+18+3=0
We add all the numbers together, and all the variables
7f+21=0
We move all terms containing f to the left, all other terms to the right
7f=-21
f=-21/7
f=-3
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