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d in (-oo:+oo)
5-5*d = 4*d-40 // - 4*d-40
5-5*d-(4*d)+40 = 0
5-5*d-4*d+40 = 0
45-9*d = 0 // - 45
-9*d = -45 // : -9
d = -45/(-9)
d = 5
d = 5
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