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k in (-oo:+oo)
(2/3)*k+2/5 = 32/5 // - 32/5
(2/3)*k+2/5-(32/5) = 0
(2/3)*k+2/5-32/5 = 0
2/3*k-6 = 0 // + 6
2/3*k = 6 // : 2/3
k = 6/2/3
k = 9
k = 9
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