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90=8f-10
We move all terms to the left:
90-(8f-10)=0
We get rid of parentheses
-8f+10+90=0
We add all the numbers together, and all the variables
-8f+100=0
We move all terms containing f to the left, all other terms to the right
-8f=-100
f=-100/-8
f=12+1/2
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