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9f=10f+13
We move all terms to the left:
9f-(10f+13)=0
We get rid of parentheses
9f-10f-13=0
We add all the numbers together, and all the variables
-1f-13=0
We move all terms containing f to the left, all other terms to the right
-f=13
f=13/-1
f=-13
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