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z in (-oo:+oo)
7/2-(z/9) = 5/18 // - 5/18
7/2-(z/9)-(5/18) = 0
7/2-(z/9)-5/18 = 0
29/9-1/9*z = 0 // - 29/9
-1/9*z = -29/9 // : -1/9
z = -29/9/(-1/9)
z = 29
z = 29
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