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-10f=-7-9f
We move all terms to the left:
-10f-(-7-9f)=0
We add all the numbers together, and all the variables
-10f-(-9f-7)=0
We get rid of parentheses
-10f+9f+7=0
We add all the numbers together, and all the variables
-1f+7=0
We move all terms containing f to the left, all other terms to the right
-f=-7
f=-7/-1
f=+7
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