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-9f-8.22=-7.3f+8.78
We move all terms to the left:
-9f-8.22-(-7.3f+8.78)=0
We get rid of parentheses
-9f+7.3f-8.78-8.22=0
We add all the numbers together, and all the variables
-1.7f-17=0
We move all terms containing f to the left, all other terms to the right
-1.7f=17
f=17/-1.7
f=-10
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