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z in (-oo:+oo)
(3*z)/8-1 = -8 // + 8
(3*z)/8-1+8 = 0
3/8*z+7 = 0 // - 7
3/8*z = -7 // : 3/8
z = -7/3/8
z = -56/3
z = -56/3
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