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25=9f-2
We move all terms to the left:
25-(9f-2)=0
We get rid of parentheses
-9f+2+25=0
We add all the numbers together, and all the variables
-9f+27=0
We move all terms containing f to the left, all other terms to the right
-9f=-27
f=-27/-9
f=+3
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