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f(12)=-2(12)+4
We simplify the equation to the form, which is simple to understand
f(12)=-2(12)+4
Reorder the terms in parentheses
+(+12f)=-2*(12)+4
Remove unnecessary parentheses
+12f=-2+*(+12+)+4
Reorder the terms in parentheses
+12f=+(-24)+4
Remove unnecessary parentheses
+12f=-24+4
We move all terms containing f to the left and all other terms to the right.
+12f=-24+4
We simplify left and right side of the equation.
+12f=-20
We divide both sides of the equation by 12 to get f.
f=-1.66666666667
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