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z in (-oo:+oo)
7*z = 63/23 // - 63/23
7*z-(63/23) = 0
7*z-63/23 = 0
7*z-63/23 = 0 // + 63/23
7*z = 63/23 // : 7
z = 63/23/7
z = 9/23
z = 9/23
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