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z in (-oo:+oo)
(3/5)*z-(1/2) = 3/10 // - 3/10
(3/5)*z-(1/2)-(3/10) = 0
(3/5)*z-1/2-3/10 = 0
3/5*z-4/5 = 0 // + 4/5
3/5*z = 4/5 // : 3/5
z = 4/5/3/5
z = 4/3
z = 4/3
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