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8f=f-29
We move all terms to the left:
8f-(f-29)=0
We get rid of parentheses
8f-f+29=0
We add all the numbers together, and all the variables
7f+29=0
We move all terms containing f to the left, all other terms to the right
7f=-29
f=-29/7
f=-4+1/7
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