-6x-15=21-3x

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



-6x-15=21-3x

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

-6x+3x-21-15=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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