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k in (-oo:+oo)
(2/3)*k+4*k-7/10 = -301/30 // + -301/30
(2/3)*k+4*k-7/10-(-301/30) = 0
(2/3)*k+4*k-7/10+301/30 = 0
14/3*k+28/3 = 0 // - 28/3
14/3*k = -28/3 // : 14/3
k = -28/3/14/3
k = -2
k = -2
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