Answer:
x = 6
Explanation:
You know that PQR = 141. Angle PQR is made up of angles PQS and SQR. This means that you can add up the two angles, set it equal to PQR, and solve for x.
PQR = PQS + SQR
141 = 13x + 4 + 10x - 1
141 = 23x + 3
138 - 3 = 23x + 3 - 3
138 = 23x
138/23 = 23x/23
6 = x