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d in (-oo:+oo)
5*(3*d-1) = -20 // + 20
5*(3*d-1)+20 = 0
5*(3*d-1)+20 = 0
15*d+15 = 0
15*d+15 = 0
15*d+15 = 0 // - 15
15*d = -15 // : 15
d = -15/15
d = -1
d = -1
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