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z in (-oo:+oo)
z/9 = 9/5 // - 9/5
z/9-(9/5) = 0
z/9-9/5 = 0
1/9*z-9/5 = 0 // + 9/5
1/9*z = 9/5 // : 1/9
z = 9/5/1/9
z = 81/5
z = 81/5
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