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z in (-oo:+oo)
(3*z)/8-1 = -6 // + 6
(3*z)/8-1+6 = 0
3/8*z+5 = 0 // - 5
3/8*z = -5 // : 3/8
z = -5/3/8
z = -40/3
z = -40/3
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