A diagram is shown below.

The ray Q-S divides a straight angle P-Q-R into angle P-Q-S measuring x degrees and angle R-Q-S measuring x minus 60 degrees.

Which equation can be solved to find the measure in degrees of ?

A. 2x-60=180

B. 2x-60=90

C. x-60=90

D. x-60=180

The correct equation that can be solved to find the measure in degrees of x is:

A. 2x-60=180