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k in (-oo:+oo)
5*(k-4) = 10/3 // - 10/3
5*(k-4)-(10/3) = 0
5*(k-4)-10/3 = 0
(3*5*(k-4))/3-10/3 = 0
3*5*(k-4)-10 = 0
15*k-70 = 0
(15*k-70)/3 = 0
(15*k-70)/3 = 0 // * 3
15*k-70 = 0
15*k-70 = 0 // + 70
15*k = 70 // : 15
k = 70/15
k = 14/3
k = 14/3
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