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