6x+9=15+21+3x

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Solution for 6x+9=15+21+3x equation: 



6x+9=15+21+3x

We move all terms to the left:

6x+9-(15+21+3x)=0

We add all the numbers together, and all the variables

6x-(3x+36)+9=0

We get rid of parentheses

6x-3x-36+9=0

We add all the numbers together, and all the variables

3x-27=0

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

3x=27

x=27/3

x=9

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