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k in (-oo:+oo)
(-2/3)*k-4 = -24/7 // + -24/7
(-2/3)*k-(-24/7)-4 = 0
(-2/3)*k+24/7-4 = 0
-2/3*k-4/7 = 0 // + 4/7
-2/3*k = 4/7 // : -2/3
k = 4/7/(-2/3)
k = -6/7
k = -6/7
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