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z in (-oo:+oo)
34.5 = z/70 // - z/70
34.5-(z/70) = 0
34.5-1/70*z = 0 // - 34.5
-1/70*z = -34.5 // : -1/70
z = -34.5/(-1/70)
z = 2415.0007245
z = 2415.0007245
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