Answer:
x=8
Explanation:
Since this is an isosceles triangle, the angles in the triangle are 4x, 4x, and 84. The sum of the three angles in a triangle are 180.
4x+4x+ 84 = 180
Combine like terms
8x+84 = 180
Subtract 84 from each side
8x+84-84 = 180 - 84
8x = 96
Divide each side by 8
8x/8 = 96/12
x = 8