-6x+15=3x-21

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



-6x+15=3x-21

We move all terms to the left:

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

We get rid of parentheses

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

We add all the numbers together, and all the variables

-9x+36=0

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

-9x=-36

x=-36/-9

x=+4

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