X+21=3x-5

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Solution for X+21=3x-5 equation: 



X+21=3X-5

We move all terms to the left:

X+21-(3X-5)=0

We get rid of parentheses

X-3X+5+21=0

We add all the numbers together, and all the variables

-2X+26=0

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

-2X=-26

X=-26/-2

X=+13

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