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z in (-oo:+oo)
(3*z)/10-2 = 3 // - 3
(3*z)/10-3-2 = 0
3/10*z-5 = 0 // + 5
3/10*z = 5 // : 3/10
z = 5/3/10
z = 50/3
z = 50/3
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