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d in (-oo:+oo)
d-(6*d)+4 = -41 // + 41
d-(6*d)+4+41 = 0
d-6*d+4+41 = 0
45-5*d = 0 // - 45
-5*d = -45 // : -5
d = -45/(-5)
d = 9
d = 9
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