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9=f/4-(-6)
We move all terms to the left:
9-(f/4-(-6))=0
We multiply all the terms by the denominator
-(f+9*4-(-6))=0
We calculate terms in parentheses: -(f+9*4-(-6)), so:We get rid of parentheses
f+9*4-(-6)
We add all the numbers together, and all the variables
f+42
Back to the equation:
-(f+42)
-f-42=0
We add all the numbers together, and all the variables
-1f-42=0
We move all terms containing f to the left, all other terms to the right
-f=42
f=42/-1
f=-42
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