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d in (-oo:+oo)
6*d-7 = 2*d-23 // - 2*d-23
6*d-(2*d)-7+23 = 0
6*d-2*d-7+23 = 0
4*d+16 = 0 // - 16
4*d = -16 // : 4
d = -16/4
d = -4
d = -4
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