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z in (-oo:+oo)
7 = z/7.4 // - z/7.4
7-(z/7.4) = 0
7-0.13513514*z = 0
7-0.13513514*z = 0 // - 7
-0.13513514*z = -7 // : -0.13513514
z = -7/(-0.13513514)
z = 51.79999814
z = 51.79999814
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