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7f-2=8f-10
We move all terms to the left:
7f-2-(8f-10)=0
We get rid of parentheses
7f-8f+10-2=0
We add all the numbers together, and all the variables
-1f+8=0
We move all terms containing f to the left, all other terms to the right
-f=-8
f=-8/-1
f=+8
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