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8f=-13+9f
We move all terms to the left:
8f-(-13+9f)=0
We add all the numbers together, and all the variables
8f-(9f-13)=0
We get rid of parentheses
8f-9f+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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