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z in (-oo:+oo)
7/10 = z/(-5) // - z/(-5)
7/10-(z/(-5)) = 0
1/5*z+7/10 = 0 // - 7/10
1/5*z = -7/10 // : 1/5
z = -7/10/1/5
z = -7/2
z = -7/2
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