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z in (-oo:+oo)
z/8 = 9/20 // - 9/20
z/8-(9/20) = 0
z/8-9/20 = 0
1/8*z-9/20 = 0 // + 9/20
1/8*z = 9/20 // : 1/8
z = 9/20/1/8
z = 18/5
z = 18/5
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