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k in (-oo:+oo)
(2/3)*(k-5) = -4 // + 4
(2/3)*(k-5)+4 = 0
2/3*(k-5)+4 = 0
2/3*(k-5)+4 = 0
2/3*k+2/3 = 0
2/3*k+2/3 = 0
2/3*k+2/3 = 0 // - 2/3
2/3*k = -2/3 // : 2/3
k = -2/3/2/3
k = -1
k = -1
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