X+21=4x-8

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Solution for X+21=4x-8 equation: 



X+21=4X-8

We move all terms to the left:

X+21-(4X-8)=0

We get rid of parentheses

X-4X+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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