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k in (-oo:+oo)
-19/10 = 3*k-5*k-(1/2) // - 3*k-5*k-(1/2)
1/2-(-5*k)-(3*k)-19/10 = 0
5*k-3*k-19/10+1/2 = 0
2*k-7/5 = 0 // + 7/5
2*k = 7/5 // : 2
k = 7/5/2
k = 7/10
k = 7/10
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