25=-3d+7d+9

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Solution for 25=-3d+7d+9 equation: 


d in (-oo:+oo)

25 = 7*d-3*d+9 // - 7*d-3*d+9

25-(-3*d)-(7*d)-9 = 0

3*d-7*d-9+25 = 0

16-4*d = 0 // - 16

-4*d = -16 // : -4

d = -16/(-4)

d = 4

d = 4

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