To have infinite solutions, both sides of the equation must be equal, we have to end with a statement that is true no matter what:
-14x+P = Qx+18
-14x = Qx
So, Q must be -14
-14x = -14x
For the next term
P = 18
So:
-14x+18 =-14x+18
Values:
P =18
Q=-14
