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k in (-oo:+oo)
-19/2 = 3*k-2*k+1/2 // - 3*k-2*k+1/2
-(-2*k)-(3*k)-19/2-(1/2) = 0
2*k-3*k-19/2-1/2 = 0
-k-10 = 0 // + 10
-k = 10 // * -1
k = -10
k = -10
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