Question

How do I solve for x with an equilateral/equiangular triangle that has the equation 13x-5 in it and that's all that says find x

Answer 1

Based on your description that 13x-5 is inside the triangle, and next to one of the points, it appears that 13x-5 refers to the angle value.

Recall that for any equilateral triangle, the 3 angles are 60 degrees each (since 60+60+60 = 180 and all angles are congruent).

So we'll set 13x-5 equal to 60 and solve for x.

13x-5 = 60

13x = 60+5

13x = 65

x = 65/13

x = 5 is the final answer