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z in (-oo:+oo)
(3*(5-z))/2 = -z // + z
(3*(5-z))/2+z = 0
(3*(5-z))/2+(2*z)/2 = 0
3*(5-z)+2*z = 0
15-z = 0
(15-z)/2 = 0
(15-z)/2 = 0 // * 2
15-z = 0
15-z = 0 // - 15
-z = -15 // * -1
z = 15
z = 15
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