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z in (-oo:+oo)
-10-3 = z/(-8) // - z/(-8)
-(z/(-8))-10-3 = 0
1/8*z-13 = 0 // + 13
1/8*z = 13 // : 1/8
z = 13/1/8
z = 104
z = 104
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