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z in (-oo:+oo)
z/5-(1/2) = z/6 // - z/6
z/5-(z/6)-(1/2) = 0
z/5-(z/6)-1/2 = 0
1/30*z-1/2 = 0 // + 1/2
1/30*z = 1/2 // : 1/30
z = 1/2/1/30
z = 15
z = 15
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