Answer:
x = 7
Explanation:
since 2 sides are congruent, then the triangle is isosceles with base angles being congruent , both (9x - 25)
the sum of the 3 angles in the triangle = 180° , that is
9x - 25 + 9x - 25 + 104 = 180
18x + 54 = 180 ( subtract 54 from both sides )
18x = 126 ( divide both sides by 18 )
x = 7