9x+15=3x-21

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



9x+15=3x-21

We move all terms to the left:

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

We get rid of parentheses

9x-3x+21+15=0

We add all the numbers together, and all the variables

6x+36=0

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

6x=-36

x=-36/6

x=-6

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