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k in (-oo:+oo)
(-4/7)*k+1/3 = -113/21 // + -113/21
(-4/7)*k+1/3-(-113/21) = 0
(-4/7)*k+1/3+113/21 = 0
40/7-4/7*k = 0 // - 40/7
-4/7*k = -40/7 // : -4/7
k = -40/7/(-4/7)
k = 10
k = 10
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