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z in (-oo:+oo)
(3/4)*z = 51/2 // - 51/2
(3/4)*z-(51/2) = 0
(3/4)*z-51/2 = 0
3/4*z-51/2 = 0 // + 51/2
3/4*z = 51/2 // : 3/4
z = 51/2/3/4
z = 34
z = 34
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