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k in (-oo:+oo)
-50/11 = (-2/3)*k-(5*k)-3 // - (-2/3)*k-(5*k)-3
5*k-((-2/3)*k)-50/11+3 = 0
(2/3)*k+5*k-50/11+3 = 0
17/3*k-17/11 = 0 // + 17/11
17/3*k = 17/11 // : 17/3
k = 17/11/17/3
k = 3/11
k = 3/11
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