If the angle of an equilateral triangle is represented by 5x+16, what is the value of x?

if you mean that 1 interior angle of an equilateral triangle is 5x+16

then

all interior angles in an equilateral triangle are equal

all interior angles in a triangle add to 180 egrees

so if 1 interior angle is 5x+16, then 3 (5x+16) = 180

solve or x

divide both sides by 3

5x+16=60

mins 16

5x=44

x=8.8 degrees