F(x)=x+2x

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Solution for F(x)=x+2x equation: 



(F)=F+2F

We move all terms to the left:

(F)-(F+2F)=0

We add all the numbers together, and all the variables

F-(+3F)=0

We get rid of parentheses

F-3F=0

We add all the numbers together, and all the variables

-2F=0

F=0/-2

F=0

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