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