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z in (-oo:+oo)
(3/4)*z = 1/2 // - 1/2
(3/4)*z-(1/2) = 0
(3/4)*z-1/2 = 0
3/4*z-1/2 = 0 // + 1/2
3/4*z = 1/2 // : 3/4
z = 1/2/3/4
z = 2/3
z = 2/3
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