12x+15=-21

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Solution for 12x+15=-21 equation: 



12x+15=-21

We move all terms to the left:

12x+15-(-21)=0

We add all the numbers together, and all the variables

12x+36=0

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

12x=-36

x=-36/12

x=-3

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