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z in (-oo:+oo)
(3*z)/10-5 = -1 // + 1
(3*z)/10-5+1 = 0
3/10*z-4 = 0 // + 4
3/10*z = 4 // : 3/10
z = 4/3/10
z = 40/3
z = 40/3
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