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z in (-oo:+oo)
7*z = 1/7 // - 1/7
7*z-(1/7) = 0
7*z-1/7 = 0
7*z-1/7 = 0 // + 1/7
7*z = 1/7 // : 7
z = 1/7/7
z = 1/49
z = 1/49
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