x.x+3=-12

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Solution for x.x+3=-12 equation: 



x.x+3=-12

We move all terms to the left:

x.x+3-(-12)=0

We add all the numbers together, and all the variables

x.x+15=0

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

x.x=-15

x=-15/1

x=-15

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