Question 909959
Just substitute according to your rule.


Your second expression will need applying your rule two time.
... Or just use what you found from the first expression for the parenthesized part of the second expression.


{{{(4)(8)-8/4=32-2=30}}}


Now you want to find 2*(4*8)=2*30
2*30=(2)(30)-30/2=60-15=45