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6f-15=f+10
We move all terms to the left:
6f-15-(f+10)=0
We get rid of parentheses
6f-f-10-15=0
We add all the numbers together, and all the variables
5f-25=0
We move all terms containing f to the left, all other terms to the right
5f=25
f=25/5
f=5
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