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z in (-oo:+oo)
16/36 = z/54 // - z/54
16/36-(z/54) = 0
4/9-1/54*z = 0 // - 4/9
-1/54*z = -4/9 // : -1/54
z = -4/9/(-1/54)
z = 24
z = 24
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