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k in (-oo:+oo)
4*k-10 = (-1/3)*k+29 // - (-1/3)*k+29
4*k-((-1/3)*k)-29-10 = 0
4*k+(1/3)*k-29-10 = 0
13/3*k-39 = 0 // + 39
13/3*k = 39 // : 13/3
k = 39/13/3
k = 9
k = 9
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