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z in (-oo:+oo)
(3*z)/8-9 = -7 // + 7
(3*z)/8-9+7 = 0
3/8*z-2 = 0 // + 2
3/8*z = 2 // : 3/8
z = 2/3/8
z = 16/3
z = 16/3
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