The answer is 10 degrees because QWX and WXT are equal. So, 2(x+2)=x+7.
Distribute: 2x+4=x+7
Solve: x=3
Then, you substitute this value of x back in to QWX - 2(3+2) and solve. 3+2 equals 5 and 5*2 is 10. Therefore, angle QWX has a measurement of 10 degrees.