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d in (-oo:+oo)
7*d-2*d+6 = 31/11 // - 31/11
7*d-2*d-(31/11)+6 = 0
7*d-2*d-31/11+6 = 0
5*d+35/11 = 0 // - 35/11
5*d = -35/11 // : 5
d = -35/11/5
d = -7/11
d = -7/11
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