-3d+7-d=55

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Solution for -3d+7-d=55 equation: 


d in (-oo:+oo)

7-3*d-d = 55 // - 55

7-3*d-d-55 = 0

-4*d-48 = 0 // + 48

-4*d = 48 // : -4

d = 48/(-4)

d = -12

d = -12

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