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k in (-oo:+oo)
(-5/7)*k+1/4 = -153/28 // + -153/28
(-5/7)*k+1/4-(-153/28) = 0
(-5/7)*k+1/4+153/28 = 0
40/7-5/7*k = 0 // - 40/7
-5/7*k = -40/7 // : -5/7
k = -40/7/(-5/7)
k = 8
k = 8
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