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z in (-oo:+oo)
(4*z)/9-2 = -4 // + 4
(4*z)/9-2+4 = 0
4/9*z+2 = 0 // - 2
4/9*z = -2 // : 4/9
z = -2/4/9
z = -9/2
z = -9/2
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