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52=25-(9f)
We move all terms to the left:
52-(25-(9f))=0
We add all the numbers together, and all the variables
-(-9f+25)+52=0
We get rid of parentheses
9f-25+52=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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