Question 660897
x = longest side
y = 1/2x
z = x - 12
x+y+x=73
Substitute all into the equation

x+1/2x+x-12 = 73
combine like terms
2 1/2x - 12 = 73
2 1/2x = 73+12
5/2x = 85
x = 85/(5/2)
x = 85(2/5)
x = 34

x = 34
y = 1/2(34) = 17
z = 34-12 = 22