x+3+3x=-21 - solution

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Solution for x+3+3x=-21 equation:

x in (-oo:+oo)

x+3*x+3 = -21 // + 21

x+3*x+3+21 = 0

4*x+24 = 0 // - 24

4*x = -24 // : 4

x = -24/4

x = -6

x = -6

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