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k in (-oo:+oo)
50 = 2*k+6*k+10 // - 2*k+6*k+10
50-(2*k)-(6*k)-10 = 0
50-2*k-6*k-10 = 0
40-8*k = 0 // - 40
-8*k = -40 // : -8
k = -40/(-8)
k = 5
k = 5
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