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z in (-oo:+oo)
(4*z)/9-6 = 7 // - 7
(4*z)/9-7-6 = 0
4/9*z-13 = 0 // + 13
4/9*z = 13 // : 4/9
z = 13/4/9
z = 117/4
z = 117/4
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