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