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z in (-oo:+oo)
(3/14)*z = 9/4 // - 9/4
(3/14)*z-(9/4) = 0
(3/14)*z-9/4 = 0
3/14*z-9/4 = 0 // + 9/4
3/14*z = 9/4 // : 3/14
z = 9/4/3/14
z = 21/2
z = 21/2
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