3x+21=6x+42

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Solution for 3x+21=6x+42 equation: 



3x+21=6x+42

We move all terms to the left:

3x+21-(6x+42)=0

We get rid of parentheses

3x-6x-42+21=0

We add all the numbers together, and all the variables

-3x-21=0

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

-3x=21

x=21/-3

x=-7

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