Answer:
x = 69
Step-by-step explanation:
angles in a triangle add up to equal 180
which means that, x + x + x - 27 = 180
x + x + x = 3x
3x - 27 = 180
* add 27 to both sides *
-27 + 27 cancels out
180 + 27 = 207
207 = 3x
* divide both sides by 3 *
3x / 3 = x
207 / 3 = 69
we're left with x = 69
