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k in (-oo:+oo)
3/3 = (9/10)*k // - (9/10)*k
3/3-((9/10)*k) = 0
(-9/10)*k+3/3 = 0
1-9/10*k = 0 // - 1
-9/10*k = -1 // : -9/10
k = -1/(-9/10)
k = 10/9
k = 10/9
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