Question 783421
let x be the measure of 1
then x+7 is the measure of angle 2
and x+7+7 is the measure of angle 3
so we have x +x+7 +x+14 =180
3x +21 = 180
3x = 159
x = 53
angle 1 = 53
angle 2 = 60
angle 3 = 67
and 53 +60 +67 = 180
180 = 180