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