-9+6d+3d=90 - solution

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Solution for -9+6d+3d=90 equation:

d in (-oo:+oo)

6*d+3*d-9 = 90 // - 90

6*d+3*d-90-9 = 0

9*d-99 = 0 // + 99

9*d = 99 // : 9

d = 99/9

d = 11

d = 11

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