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z in (-oo:+oo)
(6/7)*z = 3/4 // - 3/4
(6/7)*z-(3/4) = 0
(6/7)*z-3/4 = 0
6/7*z-3/4 = 0 // + 3/4
6/7*z = 3/4 // : 6/7
z = 3/4/6/7
z = 7/8
z = 7/8
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