6+3d=-21 - solution

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Solution for 6+3d=-21 equation:

d in (-oo:+oo)

3*d+6 = -21 // + 21

3*d+6+21 = 0

3*d+27 = 0 // - 27

3*d = -27 // : 3

d = -27/3

d = -9

d = -9

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