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k in (-oo:+oo)
k/2-((k-4)/4) = 9/4 // - 9/4
k/2-((k-4)/4)-(9/4) = 0
k/2-((k-4)/4)-9/4 = 0
(-1*(k-4))/4+k/2-9/4 = 0
(-1*2*(k-4))/(2*4)+(4*k)/(2*4)+(-9*2)/(2*4) = 0
4*k-1*2*(k-4)-9*2 = 0
2*k-18+8 = 0
2*k-10 = 0
(2*k-10)/(2*4) = 0
(2*k-10)/(2*4) = 0 // * 2*4
2*k-10 = 0
2*k-10 = 0 // + 10
2*k = 10 // : 2
k = 10/2
k = 5
k = 5
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