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z in (-oo:+oo)
(7*z)/4 = 8/9 // - 8/9
(7*z)/4-(8/9) = 0
(7*z)/4-8/9 = 0
7/4*z-8/9 = 0 // + 8/9
7/4*z = 8/9 // : 7/4
z = 8/9/7/4
z = 32/63
z = 32/63
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