f(-1)=2(-1)

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Solution for f(-1)=2(-1) equation:


f(-1)=2(-1)

We simplify the equation to the form, which is simple to understand 
f(-1)=2(-1)

Reorder the terms in parentheses
+(-1f)=2*(-1)

Remove unnecessary parentheses
-1f=+2+*(-1+)

Reorder the terms in parentheses
-1f=+(-2)

Remove unnecessary parentheses
-1f=-2

We move all terms containing f to the left and all other terms to the right. 
-1f=-2

We simplify left and right side of the equation. 
-1f=-2

We divide both sides of the equation by -1 to get f. 
f=2

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