Step-by-step explanation:
[tex]\angle TRS + \angle TRV = 180 \degree \\(linear \: pair \: \angle \: s) \\ \therefore \: x\degree + (3x)\degree= 180 \degree \\ \therefore \: (4x)\degree= 180 \degree \\ \therefore \: 4x= 180 \\ \therefore \: x= \frac{180}{4} \\ x=45\\ \huge \red{ \boxed{\therefore \: x\degree = \: 45\degree }}[/tex]
