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z in (-oo:+oo)
(2/5)*(4*z-5) = 6 // - 6
(2/5)*(4*z-5)-6 = 0
2/5*(4*z-5)-6 = 0
2/5*(4*z-5)-6 = 0
8/5*z-8 = 0
8/5*z-8 = 0
8/5*z-8 = 0 // + 8
8/5*z = 8 // : 8/5
z = 8/8/5
z = 5
z = 5
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