12x+15=9x-6

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Solution for 12x+15=9x-6 equation: 



12x+15=9x-6

We move all terms to the left:

12x+15-(9x-6)=0

We get rid of parentheses

12x-9x+6+15=0

We add all the numbers together, and all the variables

3x+21=0

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

3x=-21

x=-21/3

x=-7

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