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z in (-oo:+oo)
z/5 = z/4-2 // - z/4-2
z/5-(z/4)+2 = 0
2-1/20*z = 0 // - 2
-1/20*z = -2 // : -1/20
z = -2/(-1/20)
z = 40
z = 40
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