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z in (-oo:+oo)
(3*z)/10-5 = 8 // - 8
(3*z)/10-8-5 = 0
3/10*z-13 = 0 // + 13
3/10*z = 13 // : 3/10
z = 13/3/10
z = 130/3
z = 130/3
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