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d in (-oo:+oo)
7*d+(3/4)*d-2 = 23/4 // - 23/4
7*d+(3/4)*d-(23/4)-2 = 0
7*d+(3/4)*d-23/4-2 = 0
31/4*d-31/4 = 0 // + 31/4
31/4*d = 31/4 // : 31/4
d = 31/4/31/4
d = 1
d = 1
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