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d in (-oo:+oo)
(1/2)*d+7/8 = -37/8 // + -37/8
(1/2)*d+7/8-(-37/8) = 0
(1/2)*d+7/8+37/8 = 0
1/2*d+11/2 = 0 // - 11/2
1/2*d = -11/2 // : 1/2
d = -11/2/1/2
d = -11
d = -11
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