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k in (-oo:+oo)
98 = 2*k+6*k+10 // - 2*k+6*k+10
98-(2*k)-(6*k)-10 = 0
98-2*k-6*k-10 = 0
88-8*k = 0 // - 88
-8*k = -88 // : -8
k = -88/(-8)
k = 11
k = 11
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