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d in (-oo:+oo)
5*d-(3*d)+1 = 23 // - 23
5*d-(3*d)-23+1 = 0
5*d-3*d-23+1 = 0
2*d-22 = 0 // + 22
2*d = 22 // : 2
d = 22/2
d = 11
d = 11
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