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d in (-oo:+oo)
6*d-10 = 3*d+23 // - 3*d+23
6*d-(3*d)-23-10 = 0
6*d-3*d-23-10 = 0
3*d-33 = 0 // + 33
3*d = 33 // : 3
d = 33/3
d = 11
d = 11
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