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k in (-oo:+oo)
2-6*k-(3*k) = -25 // + 25
2-6*k-(3*k)+25 = 0
2-6*k-3*k+25 = 0
27-9*k = 0 // - 27
-9*k = -27 // : -9
k = -27/(-9)
k = 3
k = 3
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