6x+15=9x+21

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



6x+15=9x+21

We move all terms to the left:

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

We get rid of parentheses

6x-9x-21+15=0

We add all the numbers together, and all the variables

-3x-6=0

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

-3x=6

x=6/-3

x=-2

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