The sum of the angles of the triangle is equal to 180°.
Let x be the measure of the each of the two angles. The equation that would best represent and relate the given measures of the angle is,
180 = x + x + 115
Group all variables and constants in each side of the equation.
180 - 115 = 2x
Simplifying,
65 = 2x
Divide the equation by 2,
32.5 = x
The value of x is equal to 32.5°.
Hence, the answer is the last choice.