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Let the unequal side be x
The measure of two equal sides: 3x-10
Perimeter of triangle = side+side+side
Perimeter = 360cm (Given)
360 = 3x-10 + 3x-10 + x
360= 7x-20
360 +20 =7x
380=7x
380/7 = x
x=54.28 cm
First side (unequal) = x = 54.28cm
Second and third side = 3x-10(equal) = 152.84 cm
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