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9f-12+28-2f=2f+15-10f-29
We move all terms to the left:
9f-12+28-2f-(2f+15-10f-29)=0
We add all the numbers together, and all the variables
9f-2f-(-8f-14)-12+28=0
We add all the numbers together, and all the variables
7f-(-8f-14)+16=0
We get rid of parentheses
7f+8f+14+16=0
We add all the numbers together, and all the variables
15f+30=0
We move all terms containing f to the left, all other terms to the right
15f=-30
f=-30/15
f=-2
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