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z in (-oo:+oo)
3.5 = z/3 // - z/3
3.5-(z/3) = 0
3.5-1/3*z = 0 // - 3.5
-1/3*z = -3.5 // : -1/3
z = -3.5/(-1/3)
z = 10.50000011
z = 10.50000011
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