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k in (-oo:+oo)
303/44 = (-2/3)*k+(1/4)*k+7 // - (-2/3)*k+(1/4)*k+7
303/44-((-2/3)*k)-((1/4)*k)-7 = 0
(2/3)*k+(-1/4)*k+303/44-7 = 0
5/12*k-5/44 = 0 // + 5/44
5/12*k = 5/44 // : 5/12
k = 5/44/5/12
k = 3/11
k = 3/11
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