F(x)=3x-40

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Solution for F(x)=3x-40 equation: 



(F)=3F-40

We move all terms to the left:

(F)-(3F-40)=0

We get rid of parentheses

F-3F+40=0

We add all the numbers together, and all the variables

-2F+40=0

We move all terms containing F to the left, all other terms to the right

-2F=-40

F=-40/-2

F=+20

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