Step-by-step explanation:
The two given angles are linear pair. Thus, the sum of their measured is 180°. Solve for x.
(3x)\degree + 126\degree = 180\degree(3x)°+126°=180°
3x + 126 = 1803x+126=180
3x = 180 - 1263x=180−126
3x = 543x=54
\begin{gathered} \frac{3x}3 = \frac{54}3 \\ \end{gathered}
3
3x
=
3
54
x = 18x=18
Therefore, the value of x is 18
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