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f(-2)=12(-2)+1
We simplify the equation to the form, which is simple to understand
f(-2)=12(-2)+1
Reorder the terms in parentheses
+(-2f)=12*(-2)+1
Remove unnecessary parentheses
-2f=+12+*(-2+)+1
Reorder the terms in parentheses
-2f=+(-24)+1
Remove unnecessary parentheses
-2f=-24+1
We move all terms containing f to the left and all other terms to the right.
-2f=-24+1
We simplify left and right side of the equation.
-2f=-23
We divide both sides of the equation by -2 to get f.
f=11.5
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