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-18-7f=2(9f+4)
We move all terms to the left:
-18-7f-(2(9f+4))=0
We calculate terms in parentheses: -(2(9f+4)), so:We get rid of parentheses
2(9f+4)
We multiply parentheses
18f+8
Back to the equation:
-(18f+8)
-7f-18f-8-18=0
We add all the numbers together, and all the variables
-25f-26=0
We move all terms containing f to the left, all other terms to the right
-25f=26
f=26/-25
f=-1+1/25
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