X-21=3x-3

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



X-21=3X-3

We move all terms to the left:

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

We get rid of parentheses

X-3X+3-21=0

We add all the numbers together, and all the variables

-2X-18=0

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

-2X=18

X=18/-2

X=-9

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