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k in (-oo:+oo)
(-22/7)*((13/4)*k-(19/6)) = (-5/6)*k-(1355/42) // - (-5/6)*k-(1355/42)
(-22/7)*((13/4)*k-(19/6))-((-5/6)*k)+1355/42 = 0
(-22/7)*((13/4)*k-19/6)+(5/6)*k+1355/42 = 0
(5*k)/6-22/7*(13/4*k-19/6)+1355/42 = 0
(-22/7*6*42*(13/4*k-19/6))/(6*42)+(5*42*k)/(6*42)+(6*1355)/(6*42) = 0
5*42*k-22/7*6*42*(13/4*k-19/6)+6*1355 = 0
2508-2364*k+8130 = 0
10638-2364*k = 0
(10638-2364*k)/(6*42) = 0
(10638-2364*k)/(6*42) = 0 // * 6*42
10638-2364*k = 0
10638-2364*k = 0 // - 10638
-2364*k = -10638 // : -2364
k = -10638/(-2364)
k = 9/2
k = 9/2
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