x+2x+9=-21

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Solution for x+2x+9=-21 equation: 



x+2x+9=-21

We move all terms to the left:

x+2x+9-(-21)=0

We add all the numbers together, and all the variables

3x+30=0

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

3x=-30

x=-30/3

x=-10

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