F(x)=40-3x

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



(F)=40-3F

We move all terms to the left:

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

We add all the numbers together, and all the variables

F-(-3F+40)=0

We get rid of parentheses

F+3F-40=0

We add all the numbers together, and all the variables

4F-40=0

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

4F=40

F=40/4

F=10

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