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k in (-oo:+oo)
5*(2*k-2) = -90 // + 90
5*(2*k-2)+90 = 0
5*(2*k-2)+90 = 0
10*k+80 = 0
10*k+80 = 0
10*k+80 = 0 // - 80
10*k = -80 // : 10
k = -80/10
k = -8
k = -8
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