2x+9=-12-x - solution

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Solution for 2x+9=-12-x equation:

x in (-oo:+oo)

2*x+9 = -x-12 // + -x-12

2*x+x+9+12 = 0

3*x+21 = 0 // - 21

3*x = -21 // : 3

x = -21/3

x = -7

x = -7

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