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k in (-oo:+oo)
10-k = (2*k)/3+5 // - (2*k)/3+5
10-k-((2*k)/3)-5 = 0
(-2/3)*k-k-5+10 = 0
5-5/3*k = 0 // - 5
-5/3*k = -5 // : -5/3
k = -5/(-5/3)
k = 3
k = 3
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