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z in (-oo:+oo)
(6/7)*z = 3/8 // - 3/8
(6/7)*z-(3/8) = 0
(6/7)*z-3/8 = 0
6/7*z-3/8 = 0 // + 3/8
6/7*z = 3/8 // : 6/7
z = 3/8/6/7
z = 7/16
z = 7/16
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