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k in (-oo:+oo)
96 = 2*k+7*k+6 // - 2*k+7*k+6
96-(2*k)-(7*k)-6 = 0
96-2*k-7*k-6 = 0
90-9*k = 0 // - 90
-9*k = -90 // : -9
k = -90/(-9)
k = 10
k = 10
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