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k in (-oo:+oo)
3*k-(5*k)+2 = -20 // + 20
3*k-(5*k)+2+20 = 0
3*k-5*k+2+20 = 0
22-2*k = 0 // - 22
-2*k = -22 // : -2
k = -22/(-2)
k = 11
k = 11
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