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z in (-oo:+oo)
7*z = 3/8 // - 3/8
7*z-(3/8) = 0
7*z-3/8 = 0
7*z-3/8 = 0 // + 3/8
7*z = 3/8 // : 7
z = 3/8/7
z = 3/56
z = 3/56
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