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