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z in (-oo:+oo)
-3*z-(7*z) = 5/9 // - 5/9
-3*z-(7*z)-(5/9) = 0
-3*z-7*z-5/9 = 0
-10*z-5/9 = 0 // + 5/9
-10*z = 5/9 // : -10
z = 5/9/(-10)
z = -1/18
z = -1/18
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