Look : angle 1 + angle 3 = 180°
because it is a straight line.
Thus ;
![5x + 35 + 4x + 10 = 180](/tpl/images/0828/6155/331e6.png)
Simplification
![9x + 45 = 180](/tpl/images/0828/6155/f17ba.png)
Subtract sides 45
![9 x = 180 - 45](/tpl/images/0828/6155/009a4.png)
![9x = 135](/tpl/images/0828/6155/f0536.png)
Divided sides 9
![\frac{9}{9}x = \frac{135}{9} \\](/tpl/images/0828/6155/aeb4b.png)
![x = 15](/tpl/images/0828/6155/8e89e.png)
So x = 15°
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angle 1 = 5x + 35°
angle 1 = 5 ( 15 ) + 35°
angle 1 = 75° + 35°
angle 1 = 110°
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angle 1 + angle 2 = 180°
110° + angle 2 = 180°
Subtract sides 110°
angle 2 = 180° - 110°
angle 2 = 70°
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And we're done...♥️♥️♥️♥️♥️