[tex]\qquad \qquad\huge \underline{\boxed{\sf Answer}}[/tex]
In the given diagram, The shown angles form Linear pair. And according to that property the sum of measures of the two Angles equals to 180°
Now, let's use the equation to solve for x ~
[tex]\qquad \sf \dashrightarrow \:( 13x + 6) + (29x + 6) = 180 \degree[/tex]
[tex]\qquad \sf \dashrightarrow \: 13x + 6 + 29x + 6= 180 \degree[/tex]
[tex]\qquad \sf \dashrightarrow \: 13x + 29x + 6 + 6= 180 \degree[/tex]
[tex]\qquad \sf \dashrightarrow \: 42x + 12= 180 \degree[/tex]
[tex]\qquad \sf \dashrightarrow \: 42x = 180 \degree - 12 \degree[/tex]
[tex]\qquad \sf \dashrightarrow \: 42x = 168 \degree [/tex]
[tex]\qquad \sf \dashrightarrow \: x = 168 \degree \div 42[/tex]
[tex]\qquad \sf \dashrightarrow \: x = 4 \degree[/tex]
[tex]\fbox \colorbox{black}{ \colorbox{white}{x} \: \: \: \: \: \: \: \: \colorbox{white}{=} \: \: \: \: \: + \colorbox{white}{4 \degree}}[/tex]