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z in (-oo:+oo)
9/2-(z/9) = 7/18 // - 7/18
9/2-(z/9)-(7/18) = 0
9/2-(z/9)-7/18 = 0
37/9-1/9*z = 0 // - 37/9
-1/9*z = -37/9 // : -1/9
z = -37/9/(-1/9)
z = 37
z = 37
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