Find the measure of the angle indicated in bold

Step-by-step explanation:

15)11x+12=12x+4 => -x=-8 => x=8 => the indicated angle will be:12x+4=96+4=100

16)x+93+x+103=180 => 2x+196=180 => 2x=-16 => x=-8 => the indicated angle will be: x+93=-8+93=85

17)12x-6+10x+10=180 => 22x+4=180=> 22x=176 => x=8 => the indicated angle will be: 10x+10=90

18) 7x+4=6x+12 => x=8 => the indicated angle will be: 6x+12=60

19)17x+6+7x+6=180 => 24x=168 => x=7 => the indicated angle will be: 7x+6=55

20)24x+5+10x+5=180 => 34x=170 => x=5 => the indicated angle will be: 24x+5=125

The picture down below will help you to understand this exercise better.