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d in (-oo:+oo)
7*d+2 = 11/2 // - 11/2
7*d-(11/2)+2 = 0
7*d-11/2+2 = 0
7*d-7/2 = 0 // + 7/2
7*d = 7/2 // : 7
d = 7/2/7
d = 1/2
d = 1/2
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