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z in (-oo:+oo)
(3*z)/10-1 = 9 // - 9
(3*z)/10-9-1 = 0
3/10*z-10 = 0 // + 10
3/10*z = 10 // : 3/10
z = 10/3/10
z = 100/3
z = 100/3
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