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d in (-oo:+oo)
5-(2*d) = 7*d+23 // - 7*d+23
5-(2*d)-(7*d)-23 = 0
5-2*d-7*d-23 = 0
-9*d-18 = 0 // + 18
-9*d = 18 // : -9
d = 18/(-9)
d = -2
d = -2
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