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f(3)=0
We simplify the equation to the form, which is simple to understand
f(3)=0
Reorder the terms in parentheses
+(+3f)=0
Remove unnecessary parentheses
+3f=0
We move all terms containing f to the left and all other terms to the right.
+3f=0
We simplify left and right side of the equation.
+3f=0
We divide both sides of the equation by 3 to get f.
f=0
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