2x = 60°
x = 30°
To solve this, you subtract 90° (thevright angle) from 180° (all triangles have 180°). This means that the total of 2x and x is 90°.
Because there are 3 x's in total, we get
which can be simplified to
by dividing both sides by 3.
This means that x=30°, and then multiplying x by 2 to get 2x=60°.