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d in (-oo:+oo)
4*d+1 = 7*d-23 // - 7*d-23
4*d-(7*d)+1+23 = 0
4*d-7*d+1+23 = 0
24-3*d = 0 // - 24
-3*d = -24 // : -3
d = -24/(-3)
d = 8
d = 8
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