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k in (-oo:+oo)
102 = 6*k+4*k-8 // - 6*k+4*k-8
8-(6*k)-(4*k)+102 = 0
8-6*k-4*k+102 = 0
110-10*k = 0 // - 110
-10*k = -110 // : -10
k = -110/(-10)
k = 11
k = 11
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