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k in (-oo:+oo)
4 = (144*k)/8 // - (144*k)/8
4-((144*k)/8) = 0
4-18*k = 0
4-18*k = 0 // - 4
-18*k = -4 // : -18
k = -4/(-18)
k = 2/9
k = 2/9
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