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z in (-oo:+oo)
6/(-6)-5*z-(3*z)-7+7 = 0
6/(-6)-5*z-3*z-7+7 = 0
-8*z-1 = 0 // + 1
-8*z = 1 // : -8
z = 1/(-8)
z = -1/8
z = -1/8
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