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z in (-oo:+oo)
(1/2)*z = 91/4 // - 91/4
(1/2)*z-(91/4) = 0
(1/2)*z-91/4 = 0
1/2*z-91/4 = 0 // + 91/4
1/2*z = 91/4 // : 1/2
z = 91/4/1/2
z = 91/2
z = 91/2
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