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k in (-oo:+oo)
3*k+(1/6)*k+2/9 = -55/9 // + -55/9
3*k+(1/6)*k+2/9-(-55/9) = 0
3*k+(1/6)*k+2/9+55/9 = 0
19/6*k+19/3 = 0 // - 19/3
19/6*k = -19/3 // : 19/6
k = -19/3/19/6
k = -2
k = -2
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