f(20)=210-20(20)

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Solution for f(20)=210-20(20) equation:


f(20)=210-20(20)

We simplify the equation to the form, which is simple to understand 
f(20)=210-20(20)

Reorder the terms in parentheses
+(+20f)=210-20*(20)

Remove unnecessary parentheses
+20f=+210-20+*(+20+)

Reorder the terms in parentheses
+20f=210+(-400)

Remove unnecessary parentheses
+20f=+210-400

We move all terms containing f to the left and all other terms to the right. 
+20f=+210-400

We simplify left and right side of the equation. 
+20f=-190

We divide both sides of the equation by 20 to get f. 
f=-9.5

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