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10-9f=-7f
We move all terms to the left:
10-9f-(-7f)=0
We get rid of parentheses
-9f+7f+10=0
We add all the numbers together, and all the variables
-2f+10=0
We move all terms containing f to the left, all other terms to the right
-2f=-10
f=-10/-2
f=+5
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