Question

HELP PLEASE

Which best represents an equation to solve for x?
3x = 75
3x +75 = 90
3x + 75 + 90 = 180
3x + 75 +90 = 360

Answer 1

3x + 75 + 90 = 180

x = 5°

Explanation:

3x + 75° + 90° = 180°( being sum of angles of triangle)

3x = 180° - 75°- 90°

3x = 15°

x = 15° / 3

x = 5°