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z in (-oo:+oo)
2/0.21 = z/9.65 // - z/9.65
2/0.21-(z/9.65) = 0
2/0.21-0.10362694*z = 0
9.52380952-0.10362694*z = 0 // - 9.52380952
-0.10362694*z = -9.52380952 // : -0.10362694
z = -9.52380952/(-0.10362694)
z = 91.90476453
z = 91.90476453
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