21=2x+x-8

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Solution for 21=2x+x-8 equation: 



21=2x+x-8

We move all terms to the left:

21-(2x+x-8)=0

We add all the numbers together, and all the variables

-(3x-8)+21=0

We get rid of parentheses

-3x+8+21=0

We add all the numbers together, and all the variables

-3x+29=0

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

-3x=-29

x=-29/-3

x=9+2/3

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