Question 357231
let the first side =x
second = 3x
third side = 3x-5
..
x+3x+3x-5=72
7x-5=72
add 5
7x=72+5
7x=77
x= 11 the first side
second side = 3x= 33
third side = 33-5= 28 
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longest = second side = 33
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m.ananth@hotmail.ca