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z in (-oo:+oo)
(3*z)/10-8 = 3 // - 3
(3*z)/10-8-3 = 0
3/10*z-11 = 0 // + 11
3/10*z = 11 // : 3/10
z = 11/3/10
z = 110/3
z = 110/3
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