f(-1)=9

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Solution for f(-1)=9 equation:


f(-1)=9

We simplify the equation to the form, which is simple to understand 
f(-1)=9

Reorder the terms in parentheses
+(-1f)=9

Remove unnecessary parentheses
-1f=+9

We move all terms containing f to the left and all other terms to the right. 
-1f=+9

We simplify left and right side of the equation. 
-1f=+9

We divide both sides of the equation by -1 to get f. 
f=-9

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