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z in (-oo:+oo)
7*z = 1/4 // - 1/4
7*z-(1/4) = 0
7*z-1/4 = 0
7*z-1/4 = 0 // + 1/4
7*z = 1/4 // : 7
z = 1/4/7
z = 1/28
z = 1/28
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