-9+d-2d=-12 - solution

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Solution for -9+d-2d=-12 equation:

d in (-oo:+oo)

d-(2*d)-9 = -12 // + 12

d-(2*d)-9+12 = 0

d-2*d-9+12 = 0

3-d = 0 // - 3

-d = -3 // * -1

d = 3

d = 3

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