12x-30=15x-9+4x

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Solution for 12x-30=15x-9+4x equation: 



12x-30=15x-9+4x

We move all terms to the left:

12x-30-(15x-9+4x)=0

We add all the numbers together, and all the variables

12x-(19x-9)-30=0

We get rid of parentheses

12x-19x+9-30=0

We add all the numbers together, and all the variables

-7x-21=0

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

-7x=21

x=21/-7

x=-3

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