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-10f-8=7f+9
We move all terms to the left:
-10f-8-(7f+9)=0
We get rid of parentheses
-10f-7f-9-8=0
We add all the numbers together, and all the variables
-17f-17=0
We move all terms containing f to the left, all other terms to the right
-17f=17
f=17/-17
f=-1
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