9x+15=-3x

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Solution for 9x+15=-3x equation: 



9x+15=-3x

We move all terms to the left:

9x+15-(-3x)=0

We get rid of parentheses

9x+3x+15=0

We add all the numbers together, and all the variables

12x+15=0

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

12x=-15

x=-15/12

x=-1+1/4

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