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z in (-oo:+oo)
(4*z)/10-3 = 10 // - 10
(4*z)/10-10-3 = 0
2/5*z-13 = 0 // + 13
2/5*z = 13 // : 2/5
z = 13/2/5
z = 65/2
z = 65/2
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