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-6f+100=9f-90
We move all terms to the left:
-6f+100-(9f-90)=0
We get rid of parentheses
-6f-9f+90+100=0
We add all the numbers together, and all the variables
-15f+190=0
We move all terms containing f to the left, all other terms to the right
-15f=-190
f=-190/-15
f=12+2/3
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