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