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15f=17f-10
We move all terms to the left:
15f-(17f-10)=0
We get rid of parentheses
15f-17f+10=0
We add all the numbers together, and all the variables
-2f+10=0
We move all terms containing f to the left, all other terms to the right
-2f=-10
f=-10/-2
f=+5
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