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-19+9f=4(2f+7)
We move all terms to the left:
-19+9f-(4(2f+7))=0
We calculate terms in parentheses: -(4(2f+7)), so:We get rid of parentheses
4(2f+7)
We multiply parentheses
8f+28
Back to the equation:
-(8f+28)
9f-8f-28-19=0
We add all the numbers together, and all the variables
f-47=0
We move all terms containing f to the left, all other terms to the right
f=47
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