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f(-1)=-2(1-3)+2
We simplify the equation to the form, which is simple to understand
f(-1)=-2(1-3)+2
Reorder the terms in parentheses
+(-1f)=-2*(-2)+2
Remove unnecessary parentheses
-1f=-2+*(-2+)+2
Reorder the terms in parentheses
-1f=+(+4)+2
Remove unnecessary parentheses
-1f=+4+2
We move all terms containing f to the left and all other terms to the right.
-1f=+4+2
We simplify left and right side of the equation.
-1f=+6
We divide both sides of the equation by -1 to get f.
f=-6
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