Answer:
x = 22/3
Step-by-step explanation:
QR + RS = QS
=> 2x + 1 + 4x + 17 = 9x - 4
-3x = -22
QS = QR + RS
9x -4 = 2x -1 + (4x +17)
9x- 4 = 6x +16
9x - 6x= 16+ 4
3x= 20
x= 20/3= 6.66
