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z in (-oo:+oo)
2.7-(z/4.6) = -1.2 // + 1.2
1.2-(z/4.6)+2.7 = 0
1.2-0.2173913*z+2.7 = 0
3.9-0.2173913*z = 0 // - 3.9
-0.2173913*z = -3.9 // : -0.2173913
z = -3.9/(-0.2173913)
z = 17.94000036
z = 17.94000036
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