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d in (-oo:+oo)
2*d-9 = -15/2 // + -15/2
2*d-(-15/2)-9 = 0
2*d+15/2-9 = 0
2*d-3/2 = 0 // + 3/2
2*d = 3/2 // : 2
d = 3/2/2
d = 3/4
d = 3/4
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