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z in (-oo:+oo)
(6*z)/7-((4*z)/9) = 1 // - 1
(6*z)/7-((4*z)/9)-1 = 0
(6*z)/7+(-4/9)*z-1 = 0
26/63*z-1 = 0 // + 1
26/63*z = 1 // : 26/63
z = 1/26/63
z = 63/26
z = 63/26
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