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z in (-oo:+oo)
1/4 = z/20 // - z/20
1/4-(z/20) = 0
1/4-1/20*z = 0 // - 1/4
-1/20*z = -1/4 // : -1/20
z = -1/4/(-1/20)
z = 5
z = 5
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