Question 1071929
.
x + x + (x+7) = 73.

Solve for x:

3x + 7 = 73  --->  3x = 73 - 7 = 66  --->  x = {{{66/3}}} = 22.


One side is 22 inches long, second side has the same length, the third side is of 22+7 = 29 inches long.