12x=-9x-15

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



12x=-9x-15

We move all terms to the left:

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

We get rid of parentheses

12x+9x+15=0

We add all the numbers together, and all the variables

21x+15=0

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

21x=-15

x=-15/21

x=-5/7

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