3x-21=6x+18

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Solution for 3x-21=6x+18 equation: 



3x-21=6x+18

We move all terms to the left:

3x-21-(6x+18)=0

We get rid of parentheses

3x-6x-18-21=0

We add all the numbers together, and all the variables

-3x-39=0

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

-3x=39

x=39/-3

x=-13

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