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k in (-oo:+oo)
2/3 = (9/10)*k // - (9/10)*k
2/3-((9/10)*k) = 0
(-9/10)*k+2/3 = 0
2/3-9/10*k = 0 // - 2/3
-9/10*k = -2/3 // : -9/10
k = -2/3/(-9/10)
k = 20/27
k = 20/27
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