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