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k in (-oo:+oo)
(2/3)*k-12 = 6.5 // - 6.5
(2/3)*k-12-6.5 = 0
2/3*k-18.5 = 0 // + 18.5
2/3*k = 18.5 // : 2/3
k = 18.5/2/3
k = 27.74999986
k = 27.74999986
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