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z in (-oo:+oo)
-15 = (-3/4)*z // - (-3/4)*z
-((-3/4)*z)-15 = 0
(3/4)*z-15 = 0
3/4*z-15 = 0 // + 15
3/4*z = 15 // : 3/4
z = 15/3/4
z = 20
z = 20
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