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d in (-oo:+oo)
5*(-d-9) = -90 // + 90
5*(-d-9)+90 = 0
5*(-d-9)+90 = 0
45-5*d = 0
45-5*d = 0
45-5*d = 0 // - 45
-5*d = -45 // : -5
d = -45/(-5)
d = 9
d = 9
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