15+6x=9x+21

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



15+6x=9x+21

We move all terms to the left:

15+6x-(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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