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z in (-oo:+oo)
12/19 = -4*z // + -4*z
12/19-(-4*z) = 0
4*z+12/19 = 0
4*z+12/19 = 0 // - 12/19
4*z = -12/19 // : 4
z = -12/19/4
z = -3/19
z = -3/19
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