F(x)=9x+3x=-10

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Solution for F(x)=9x+3x=-10 equation: 



(F)=9F+3F=-10

We move all terms to the left:

(F)-(9F+3F)=0

We add all the numbers together, and all the variables

F-(+12F)=0

We get rid of parentheses

F-12F=0

We add all the numbers together, and all the variables

-11F=0

F=0/-11

F=0

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