f(3)=120-30(3)

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Solution for f(3)=120-30(3) equation:


f(3)=120-30(3)

We simplify the equation to the form, which is simple to understand 
f(3)=120-30(3)

Reorder the terms in parentheses
+(+3f)=120-30*(3)

Remove unnecessary parentheses
+3f=+120-30+*(+3+)

Reorder the terms in parentheses
+3f=120+(-90)

Remove unnecessary parentheses
+3f=+120-90

We move all terms containing f to the left and all other terms to the right. 
+3f=+120-90

We simplify left and right side of the equation. 
+3f=+30

We divide both sides of the equation by 3 to get f. 
f=10

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