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z in (-oo:+oo)
-1.2 = z/4.6-2.7 // - z/4.6-2.7
2.7-(z/4.6)-1.2 = 0
2.7-0.2173913*z-1.2 = 0
1.5-0.2173913*z = 0 // - 1.5
-0.2173913*z = -1.5 // : -0.2173913
z = -1.5/(-0.2173913)
z = 6.90000014
z = 6.90000014
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