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k in (-oo:+oo)
(-1/2)*k = -3/22 // + -3/22
(-1/2)*k-(-3/22) = 0
(-1/2)*k+3/22 = 0
3/22-1/2*k = 0 // - 3/22
-1/2*k = -3/22 // : -1/2
k = -3/22/(-1/2)
k = 3/11
k = 3/11
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