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z in (-oo:+oo)
z/(-13.3) = 2.1 // - 2.1
z/(-13.3)-2.1 = 0
-0.07518797*z-2.1 = 0 // + 2.1
-0.07518797*z = 2.1 // : -0.07518797
z = 2.1/(-0.07518797)
z = -27.92999997
z = -27.92999997
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