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k in (-oo:+oo)
2-(2*k)-(3*k) = -23 // + 23
2-(2*k)-(3*k)+23 = 0
2-2*k-3*k+23 = 0
25-5*k = 0 // - 25
-5*k = -25 // : -5
k = -25/(-5)
k = 5
k = 5
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