Explanation:
you made a lot of typos.
the conversion formula is
C = (5/9)×(F - 32)
F = 158°
C = (5/9)(158 - 32) = (5/9)×126 = 5×14 = 70°
if for whatever reason you should indeed use
C = (5/9)(F - 160)
then that would give you
C = (5/9)(158 - 160) = (5/9)×-2 = -10/9 = -1.111111111...°
but again, this is a wrong formula to convert Fahrenheit to Celsius. the correct answer is the one above (in bold).