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z in (-oo:+oo)
25/75 = z/30 // - z/30
25/75-(z/30) = 0
1/3-1/30*z = 0 // - 1/3
-1/30*z = -1/3 // : -1/30
z = -1/3/(-1/30)
z = 10
z = 10
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