They could have 10 hotdogs which equals $7.50 and 3 drinks which equals $4.50. $7.50+$4.50 = $12
X= -12.5 you add (4+3) then, you combine it with 18 to get 25, then you divide 25 by -2x
6x + 2x - 1 = 5x + 11
8x - 1 = 5x + 11
- 5x - 5x
3x - 1 = 11
+ 1 + 1
3x = 12
3 3
x = 4
-5= -5x-10
Plus 10 from both sides
5=-5x
X = -1