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k in (-oo:+oo)
(1/3)*k-4 = -149/36 // + -149/36
(1/3)*k-(-149/36)-4 = 0
(1/3)*k+149/36-4 = 0
1/3*k+5/36 = 0 // - 5/36
1/3*k = -5/36 // : 1/3
k = -5/36/1/3
k = -5/12
k = -5/12
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