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