Angle is equilateral, two sides are 3x + 17 and 2x + 20. Solve for x and then find the length?

Equilateral means the sides are all the same so:

3x + 17 = 2x + 20 The rule is you can do any valid operation on both sides of an equation and it will still be equal. Subtract 2x.

x + 17 = 20 Subtract 17.

x = 3 and each side is 26