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z in (-oo:+oo)
-4*z = -12/8 // + -12/8
-4*z-(-12/8) = 0
3/2-4*z = 0
3/2-4*z = 0 // - 3/2
-4*z = -3/2 // : -4
z = -3/2/(-4)
z = 3/8
z = 3/8
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