Question 894558
Just follow the formula.  You have a symbolized definition for the # operation between two numbers, so just apply it.


What if you wanted x#y?  this would be 2(x-3y) and you could continue into 2x-6y.


Now you should understand plainly what to do.


Your second expression to be answered seem ambiguous.
-7#5 either means (-7)#5  or   -(7#5).  Seeing through before doing the steps is difficult.


First way,
2((-7)-3*5)
2(-7-15)
2*(-22)
-44


Second way,
-(2(7-3*5))
-(2(7-15)
-2(-8)
16


These ways are not identical.  Decide which way you want to begin with for that second example to be solved and then choose the steps accordingly  (although I just did both of these).