9+7d+3d=-61

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Solution for 9+7d+3d=-61 equation: 


d in (-oo:+oo)

7*d+3*d+9 = -61 // + 61

7*d+3*d+9+61 = 0

10*d+70 = 0 // - 70

10*d = -70 // : 10

d = -70/10

d = -7

d = -7

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