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z in (-oo:+oo)
(4*z)/10-2 = -5 // + 5
(4*z)/10-2+5 = 0
2/5*z+3 = 0 // - 3
2/5*z = -3 // : 2/5
z = -3/2/5
z = -15/2
z = -15/2
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