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z in (-oo:+oo)
-2*z-(4*z) = 2/5 // - 2/5
-2*z-(4*z)-(2/5) = 0
-2*z-4*z-2/5 = 0
-6*z-2/5 = 0 // + 2/5
-6*z = 2/5 // : -6
z = 2/5/(-6)
z = -1/15
z = -1/15
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