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k in (-oo:+oo)
32 = 3*k+3*k-10 // - 3*k+3*k-10
10-(3*k)-(3*k)+32 = 0
10-3*k-3*k+32 = 0
42-6*k = 0 // - 42
-6*k = -42 // : -6
k = -42/(-6)
k = 7
k = 7
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