12x+9=9x-15

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



12x+9=9x-15

We move all terms to the left:

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

We get rid of parentheses

12x-9x+15+9=0

We add all the numbers together, and all the variables

3x+24=0

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

3x=-24

x=-24/3

x=-8

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