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The sides are 4x, 7x and 8x long, there x is their common measure.
Hence, 4x + 7x + 8x = 76 meters (the perimeter), which implies
19x = 76,
x = 76/19 = 4 meters.
ANSWER. The sides are 4x= 4*4 = 16 meters, 7x = 7*4 = 28 meters and 8x= 8*4 = 32 meters.
Solved.