F(x)=5x+8x=4

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Solution for F(x)=5x+8x=4 equation: 



(F)=5F+8F=4

We move all terms to the left:

(F)-(5F+8F)=0

We add all the numbers together, and all the variables

F-(+13F)=0

We get rid of parentheses

F-13F=0

We add all the numbers together, and all the variables

-12F=0

F=0/-12

F=0

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