The value of x from the figure is 18
Given the following parameters
m<RQT = 125 degrees
m<RQS = 3x + 10
m<SQT = 4x + 9
Using the expression
m<RQS + m<SQT = m<RQT
3x - 10 + 4x + 9 = 125
7x - 1 = 125
7x = 125 + 1
7x = 126
x = 126/7
x = 18
Hence the value of x from the figure is 18