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90=9f+8
We move all terms to the left:
90-(9f+8)=0
We get rid of parentheses
-9f-8+90=0
We add all the numbers together, and all the variables
-9f+82=0
We move all terms containing f to the left, all other terms to the right
-9f=-82
f=-82/-9
f=9+1/9
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