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If 16x+8y represents the perimeter of a rectangle, and 5x-2y reprents its width, then what is expression of lenght?

Perimeter = 2(Length + Width),so
length = (perimeter)/2 - Width
=(16x+8y)/2 - (5x-2y)
=8x+4y - (5x-2y)
= 3x+6y

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