Answer:
-x - 3
Step-by-step explanation:
x-(2x + 3)
=> x-1(2x + 3)
=> x - 2x - 3
=> -x - 3
Therefore, this is the solution. Hoped this helped.

Answer:
your answer is x >18
Step-by-step explanation:
Jahsiah's mistake was he added 9 to both sides of the equation. He should have subtracted 9 from both sides of the equation.
Here's the solution
-2x+9<-27
-9 -9
-2x/-2x<-36/-2x
when u divide by negative in inequalities, u change the sign. So ur correct answer is x>18
hope this helped.
Are you saying 9×10 that is 90
Wouldn’t you add both of the equations together and set them equal to 180 and whatever you get for x just plug back in to find the values of the angles??