Answer:
1) 2x+19+22x-9=180
12x+22x=180-19+9
34x/34=170/34
2) 10x-20 and 7x+4
10x-20=7x+4
10x-7x=20+4
3x=24
x=8
so each marked angle:
=7(8)+4
=60°
_______________
3)-4x+5-13x+39=180
-17x+44=180
-174=180-44
x=136/17
-4x-8+5
=32+5=137°
-13x-8+39
=104+39
=143
hope it helps...
have a great day!!
