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z in (-oo:+oo)
(6*z)/5 = 7/9 // - 7/9
(6*z)/5-(7/9) = 0
(6*z)/5-7/9 = 0
6/5*z-7/9 = 0 // + 7/9
6/5*z = 7/9 // : 6/5
z = 7/9/6/5
z = 35/54
z = 35/54
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