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z in (-oo:+oo)
9/5 = z/20 // - z/20
9/5-(z/20) = 0
9/5-1/20*z = 0 // - 9/5
-1/20*z = -9/5 // : -1/20
z = -9/5/(-1/20)
z = 36
z = 36
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