I do not understand this or how to do it

Answer:
okay i gotchu
x = 8, Both PQ and QR equal 41. And PR = 82.
Step-by-step explanation:
PQ = 6x- 7
QR = 5x + 1
Since we know that Q is the midpoint, PQ and QR are equivalent.
To find the value of x, we need to set them equal to each other and solve for x.
6x - 7 = 5x + 1
6x = 5x + 8
x = 8.
Now plug x into either to find what both equal
6(8) -7 = 48- 7 = 41.
5(8) + 1 = 40+ 1 = 41.
41 = 41.
PR is just the total distance, 41+ 41 = 82. So, PR = 82.
Hope this helps