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k in (-oo:+oo)
23 = (5*k)/11-7 // - (5*k)/11-7
7-((5*k)/11)+23 = 0
(-5/11)*k+7+23 = 0
30-5/11*k = 0 // - 30
-5/11*k = -30 // : -5/11
k = -30/(-5/11)
k = 66
k = 66
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