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d in (-oo:+oo)
(1/2)*d-10 = -19/2 // + -19/2
(1/2)*d-(-19/2)-10 = 0
(1/2)*d+19/2-10 = 0
1/2*d-1/2 = 0 // + 1/2
1/2*d = 1/2 // : 1/2
d = 1/2/1/2
d = 1
d = 1
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