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9=4f-11
We move all terms to the left:
9-(4f-11)=0
We get rid of parentheses
-4f+11+9=0
We add all the numbers together, and all the variables
-4f+20=0
We move all terms containing f to the left, all other terms to the right
-4f=-20
f=-20/-4
f=+5
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