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z in (-oo:+oo)
1/2-5*z = 33 // - 33
1/2-5*z-33 = 0
-5*z-65/2 = 0 // + 65/2
-5*z = 65/2 // : -5
z = 65/2/(-5)
z = -13/2
z = -13/2
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