6x-21=15+3x

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Solution for 6x-21=15+3x equation: 



6x-21=15+3x

We move all terms to the left:

6x-21-(15+3x)=0

We add all the numbers together, and all the variables

6x-(3x+15)-21=0

We get rid of parentheses

6x-3x-15-21=0

We add all the numbers together, and all the variables

3x-36=0

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

3x=36

x=36/3

x=12

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