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z in (-oo:+oo)
3-(2*z) = 1/10 // - 1/10
3-(2*z)-(1/10) = 0
3-2*z-1/10 = 0
29/10-2*z = 0 // - 29/10
-2*z = -29/10 // : -2
z = -29/10/(-2)
z = 29/20
z = 29/20
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