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k in (-oo:+oo)
5*k-(2*k)-2 = -26 // + 26
5*k-(2*k)-2+26 = 0
5*k-2*k-2+26 = 0
3*k+24 = 0 // - 24
3*k = -24 // : 3
k = -24/3
k = -8
k = -8
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