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-10+5f=9f+10
We move all terms to the left:
-10+5f-(9f+10)=0
We get rid of parentheses
5f-9f-10-10=0
We add all the numbers together, and all the variables
-4f-20=0
We move all terms containing f to the left, all other terms to the right
-4f=20
f=20/-4
f=-5
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