F(x)=3x+7x

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Solution for F(x)=3x+7x equation: 



(F)=3F+7F

We move all terms to the left:

(F)-(3F+7F)=0

We add all the numbers together, and all the variables

F-(+10F)=0

We get rid of parentheses

F-10F=0

We add all the numbers together, and all the variables

-9F=0

F=0/-9

F=0

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