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z in (-oo:+oo)
3 = z/8.7 // - z/8.7
3-(z/8.7) = 0
3-0.11494253*z = 0
3-0.11494253*z = 0 // - 3
-0.11494253*z = -3 // : -0.11494253
z = -3/(-0.11494253)
z = 26.09999971
z = 26.09999971
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