Answer:
10 =x
Explanation:
The figure in the diagram is an equilateral triangle, which means all sides are equal and all angles are equal. If all angles are equal, each angle is equal to 60 degrees (180/3=60). Therefore <B =60.
60 = 5x+10
Subtract 10 from each side
60-10 = 5x+10 -10
50 = 5x
Divide each side by 5
50/5 = 5x/x
10 =x