3-d-6d=-18 - solution

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Solution for 3-d-6d=-18 equation:

d in (-oo:+oo)

3-d-(6*d) = -18 // + 18

3-d-(6*d)+18 = 0

3-d-6*d+18 = 0

21-7*d = 0 // - 21

-7*d = -21 // : -7

d = -21/(-7)

d = 3

d = 3

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