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k in (-oo:+oo)
(2/9)*k-(3/8) = -19/8 // + -19/8
(2/9)*k-(3/8)-(-19/8) = 0
(2/9)*k-3/8+19/8 = 0
2/9*k+2 = 0 // - 2
2/9*k = -2 // : 2/9
k = -2/2/9
k = -9
k = -9
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