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z in (-oo:+oo)
6*z+4/9 = 7*z+2/9 // - 7*z+2/9
6*z-(7*z)+4/9-(2/9) = 0
6*z-7*z+4/9-2/9 = 0
2/9-z = 0 // - 2/9
-z = -2/9 // * -1
z = 2/9
z = 2/9
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