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z in (-oo:+oo)
(3*z)/8-7 = -6 // + 6
(3*z)/8-7+6 = 0
3/8*z-1 = 0 // + 1
3/8*z = 1 // : 3/8
z = 1/3/8
z = 8/3
z = 8/3
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