Question 197070
c=cost of camera
x=cost of case
c=300+x
The cost of the camera represented by c is equal to 300 dollars plus the cost of the case which is represented as x.
x=310-c
The cost of the case represented as x equals the cost of the set minus the cost of the camera. The cost of the set is 310.

x=310-(300+x)
x=310-300-x
x=10-x
2x=10
x=5

Because the cost of the case is five dollars you subtract five from one hundred and get 95 dollars back.