15=-d+7d+3

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Solution for 15=-d+7d+3 equation: 


d in (-oo:+oo)

15 = 7*d-d+3 // - 7*d-d+3

d-(7*d)-3+15 = 0

d-7*d-3+15 = 0

12-6*d = 0 // - 12

-6*d = -12 // : -6

d = -12/(-6)

d = 2

d = 2

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