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d in (-oo:+oo)
3*d-(5*d)+3 = -15 // + 15
3*d-(5*d)+3+15 = 0
3*d-5*d+3+15 = 0
18-2*d = 0 // - 18
-2*d = -18 // : -2
d = -18/(-2)
d = 9
d = 9
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