Step-by-step explanation:
sum of all angles on a straight line is 180°
so,
125° + 7x - 1 = 180
7x + 124 = 180
7x = 180 - 124
7x = 56
x = 56/7
x = 8 ← ans
hope this answer helps you dear...take care and may u have a great day ahead dear!
