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z in (-oo:+oo)
7/8-(z/9) = 1/72 // - 1/72
7/8-(z/9)-(1/72) = 0
7/8-(z/9)-1/72 = 0
31/36-1/9*z = 0 // - 31/36
-1/9*z = -31/36 // : -1/9
z = -31/36/(-1/9)
z = 31/4
z = 31/4
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