x+3+2x=-12 - solution

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Solution for x+3+2x=-12 equation:

x in (-oo:+oo)

x+2*x+3 = -12 // + 12

x+2*x+3+12 = 0

3*x+15 = 0 // - 15

3*x = -15 // : 3

x = -15/3

x = -5

x = -5

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