The mule said, if you give me a bag, I'll pay you twice as much.
2X(x- 1)=y+ 1
( 1)y=2x-3
I'll give you a bag, and we just have so many! "
y- 1=x+ 1
(2)y=x+2
(2) Bring in (1)
x+2=2x-3
x=5
This donkey used to carry five bags of goods.