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z in (-oo:+oo)
(4/7)*z = 12/35 // - 12/35
(4/7)*z-(12/35) = 0
(4/7)*z-12/35 = 0
4/7*z-12/35 = 0 // + 12/35
4/7*z = 12/35 // : 4/7
z = 12/35/4/7
z = 3/5
z = 3/5
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