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z in (-oo:+oo)
(3*z)/8-7 = 7 // - 7
(3*z)/8-7-7 = 0
3/8*z-14 = 0 // + 14
3/8*z = 14 // : 3/8
z = 14/3/8
z = 112/3
z = 112/3
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