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k in (-oo:+oo)
(3*k)/4 = 1/4+5 // - 1/4+5
(3*k)/4-(1/4)-5 = 0
(3*k)/4-1/4-5 = 0
3/4*k-21/4 = 0 // + 21/4
3/4*k = 21/4 // : 3/4
k = 21/4/3/4
k = 7
k = 7
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