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k in (-oo:+oo)
(1/2)*k+1/4 = 31/44 // - 31/44
(1/2)*k+1/4-(31/44) = 0
(1/2)*k+1/4-31/44 = 0
1/2*k-5/11 = 0 // + 5/11
1/2*k = 5/11 // : 1/2
k = 5/11/1/2
k = 10/11
k = 10/11
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