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-24=0

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

-2x=24

x=24/-2

x=-12

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