Answer:
Step-by-step explanation:
Since this is an equilateral triangle, all the sides and the angles are equal to each other.
=> angle L = Angle N = Angle M
And if Angle N = 7x - 3
Thus all the other angle also = 7x - 3
And the sum of interior angle in a triangle is 180 degree.
We can write an equation:
Angle L + Angle N + Angle M= 180
7x - 3 + 7x - 3 + 7x - 3 = 180
21x - 9 = 180
21x = 180 + 9
21x = 189
x = 9
Therefore, x = 9