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-2f+6(-f-9)=-6
We simplify the equation to the form, which is simple to understand
-2f+6(-f-9)=-6
Reorder the terms in parentheses
-2f+(-6f-54)=-6
Remove unnecessary parentheses
-2f-6f-54=-6
We move all terms containing f to the left and all other terms to the right.
-2f-6f=-6+54
We simplify left and right side of the equation.
-8f=+48
We divide both sides of the equation by -8 to get f.
f=-6
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