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z in (-oo:+oo)
-9 = (-3/5)*z // - (-3/5)*z
-((-3/5)*z)-9 = 0
(3/5)*z-9 = 0
3/5*z-9 = 0 // + 9
3/5*z = 9 // : 3/5
z = 9/3/5
z = 15
z = 15
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