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f(-1)=-3(-1)-1
We simplify the equation to the form, which is simple to understand
f(-1)=-3(-1)-1
Reorder the terms in parentheses
+(-1f)=-3*(-1)-1
Remove unnecessary parentheses
-1f=-3+*(-1+)-1
Reorder the terms in parentheses
-1f=+(+3)-1
Remove unnecessary parentheses
-1f=+3-1
We move all terms containing f to the left and all other terms to the right.
-1f=+3-1
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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