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z in (-oo:+oo)
-12 = (-4/5)*z // - (-4/5)*z
-((-4/5)*z)-12 = 0
(4/5)*z-12 = 0
4/5*z-12 = 0 // + 12
4/5*z = 12 // : 4/5
z = 12/4/5
z = 15
z = 15
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