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d in (-oo:+oo)
4*d-1 = -6*d-41 // + -6*d-41
4*d-(-6*d)-1+41 = 0
4*d+6*d-1+41 = 0
10*d+40 = 0 // - 40
10*d = -40 // : 10
d = -40/10
d = -4
d = -4
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