Respuesta :

We apply the secant-angle theorem,

[tex]\frac{156+54}{2}=105^0[/tex]

Then,

[tex]\begin{gathered} x+105^0=180^0\text{ (angle in a straight line)} \\ x=180^0-105^0 \\ x=7^{}5^o \end{gathered}[/tex]

Therefore, x=75 degr

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