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d in (-oo:+oo)
7*d-10 = -27/2 // + -27/2
7*d-(-27/2)-10 = 0
7*d+27/2-10 = 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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