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4f+7+8f=10f-7
We move all terms to the left:
4f+7+8f-(10f-7)=0
We add all the numbers together, and all the variables
12f-(10f-7)+7=0
We get rid of parentheses
12f-10f+7+7=0
We add all the numbers together, and all the variables
2f+14=0
We move all terms containing f to the left, all other terms to the right
2f=-14
f=-14/2
f=-7
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