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k in (-oo:+oo)
k/4 = -2.2 // + 2.2
k/4+2.2 = 0
1/4*k+2.2 = 0 // - 2.2
1/4*k = -2.2 // : 1/4
k = -2.2/1/4
k = -8.8
k = -8.8
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