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4f-15=-6f+15
We move all terms to the left:
4f-15-(-6f+15)=0
We get rid of parentheses
4f+6f-15-15=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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