3X+21=6x+3

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Solution for 3X+21=6x+3 equation: 



3X+21=6X+3

We move all terms to the left:

3X+21-(6X+3)=0

We get rid of parentheses

3X-6X-3+21=0

We add all the numbers together, and all the variables

-3X+18=0

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

-3X=-18

X=-18/-3

X=+6

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