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k in (-oo:+oo)
-((4/3)*(-(5*k)-2))-2*k = 20/3-((7*k)/3) // - 20/3-((7*k)/3)
(7*k)/3-((4/3)*(-(5*k)-2))-2*k-(20/3) = 0
(-4/3)*(-5*k-2)-2*k+(7*k)/3-20/3 = 0
(7*k)/3-4/3*(-5*k-2)-2*k-20/3 = 0
(-4/3*3*(-5*k-2))/3+(-2*3*k)/3+(7*k)/3-20/3 = 0
7*k-4/3*3*(-5*k-2)-2*3*k-20 = 0
14*k+7*k-20+8 = 0
21*k-20+8 = 0
21*k-12 = 0
(21*k-12)/3 = 0
(21*k-12)/3 = 0 // * 3
21*k-12 = 0
21*k-12 = 0 // + 12
21*k = 12 // : 21
k = 12/21
k = 4/7
k = 4/7
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