circle

Angle WVT is equal to 14x+7 minus 7x+11, so 3x+4 = 7x-4

3x+4=7x-4

4x=8

x=2

Plugging x=2 back into Angle WVT, then Angle WVT equals 10 degrees.

( 14x+7 - 7x+11 )/2 = 3x+4

(7x-4) /2 = 3x+4

x = 12

3x+4 = 3*12+4 = 40               angle WVT = 40º