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k in (-oo:+oo)
5*(-(4*k)-6) = 170 // - 170
5*(-(4*k)-6)-170 = 0
5*(-4*k-6)-170 = 0
5*(-4*k-6)-170 = 0
-20*k-200 = 0
-20*k-200 = 0
-20*k-200 = 0 // + 200
-20*k = 200 // : -20
k = 200/(-20)
k = -10
k = -10
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