Answer:
x = 10
Step-by-step explanation:
The angles of a triangle must add up to 180 degrees. We know that all the angles on this triangle are the same. 180 ÷ 3 = 60. 5x + 10 has to be equal to 60.
Then it is simple algebra
5x + 10 = 60
- 10 - 10
5x = 50
÷5 ÷5
x = 10
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