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