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d in (-oo:+oo)
d+4 = 5*d-36 // - 5*d-36
d-(5*d)+4+36 = 0
d-5*d+4+36 = 0
40-4*d = 0 // - 40
-4*d = -40 // : -4
d = -40/(-4)
d = 10
d = 10
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