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Private Sub Command1_Click()
  Dim t As Double
  Dim z As Double
  Dim f As Double
  For t = 0 To 60 Step 0.1
      For z = 0 To 1000 Step 1
          f = (60 - 0.8506 * t - 5.39106) * Exp(-0.007769 * z) + 0.8506 * t + 0.00451 * z + 5.39106
          If f - t < 0.000001 Then
          Print z, t, f
          End If
      Next z
  Next t
End Sub
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