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z in (-oo:+oo)
(4*z)/9-8 = 7 // - 7
(4*z)/9-8-7 = 0
4/9*z-15 = 0 // + 15
4/9*z = 15 // : 4/9
z = 15/4/9
z = 135/4
z = 135/4
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