3x+9=-15-x - solution

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Solution for 3x+9=-15-x equation:

x in (-oo:+oo)

3*x+9 = -x-15 // + -x-15

3*x+x+9+15 = 0

4*x+24 = 0 // - 24

4*x = -24 // : 4

x = -24/4

x = -6

x = -6

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