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Lado 1: X
Lado 2: X - 4
Lado 3: 2X - 5
Perimetro = Lado1 + Lado2 + Lado
Perimetro = X + (X - 4) + (2X - 5)
Perimetro = X + X - 4 + 2X - 5
Perimetro = 4X - 9
2X + 2X-5 + X-4