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10f=8+9f
We move all terms to the left:
10f-(8+9f)=0
We add all the numbers together, and all the variables
10f-(9f+8)=0
We get rid of parentheses
10f-9f-8=0
We add all the numbers together, and all the variables
f-8=0
We move all terms containing f to the left, all other terms to the right
f=8
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