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z in (-oo:+oo)
z/3 = z/5-1 // - z/5-1
z/3-(z/5)+1 = 0
2/15*z+1 = 0 // - 1
2/15*z = -1 // : 2/15
z = -1/2/15
z = -15/2
z = -15/2
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