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k in (-oo:+oo)
(1/4)*k-((1/2)*k)+31/9 = 0
(1/4)*k+(-1/2)*k+31/9 = 0
31/9-1/4*k = 0 // - 31/9
-1/4*k = -31/9 // : -1/4
k = -31/9/(-1/4)
k = 124/9
k = 124/9
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