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z in (-oo:+oo)
2-(z/2.05) = -15 // + 15
2-(z/2.05)+15 = 0
2-0.48780488*z+15 = 0
17-0.48780488*z = 0 // - 17
-0.48780488*z = -17 // : -0.48780488
z = -17/(-0.48780488)
z = 34.84999986
z = 34.84999986
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