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