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z in (-oo:+oo)
(3*z)/8-9 = 7 // - 7
(3*z)/8-9-7 = 0
3/8*z-16 = 0 // + 16
3/8*z = 16 // : 3/8
z = 16/3/8
z = 128/3
z = 128/3
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