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8f+7=-1+10f
We move all terms to the left:
8f+7-(-1+10f)=0
We add all the numbers together, and all the variables
8f-(10f-1)+7=0
We get rid of parentheses
8f-10f+1+7=0
We add all the numbers together, and all the variables
-2f+8=0
We move all terms containing f to the left, all other terms to the right
-2f=-8
f=-8/-2
f=+4
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