21x+9=-12

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Solution for 21x+9=-12 equation: 



21x+9=-12

We move all terms to the left:

21x+9-(-12)=0

We add all the numbers together, and all the variables

21x+21=0

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

21x=-21

x=-21/21

x=-1

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