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z in (-oo:+oo)
7 = z/8.1 // - z/8.1
7-(z/8.1) = 0
7-0.12345679*z = 0
7-0.12345679*z = 0 // - 7
-0.12345679*z = -7 // : -0.12345679
z = -7/(-0.12345679)
z = 56.70000006
z = 56.70000006
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