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k in (-oo:+oo)
2.4/3.6 = k/1.5 // - k/1.5
2.4/3.6-(k/1.5) = 0
2.4/3.6-0.66666667*k = 0
0.66666667-0.66666667*k = 0 // - 0.66666667
-0.66666667*k = -0.66666667 // : -0.66666667
k = -0.66666667/(-0.66666667)
k = 1
k = 1
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