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7f-13=6f-9f+17
We move all terms to the left:
7f-13-(6f-9f+17)=0
We add all the numbers together, and all the variables
7f-(-3f+17)-13=0
We get rid of parentheses
7f+3f-17-13=0
We add all the numbers together, and all the variables
10f-30=0
We move all terms containing f to the left, all other terms to the right
10f=30
f=30/10
f=3
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