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ancho: x
area inicial : (2x)(x) = 2x^2
area final (2x+3)(x+3) - 2x^2 = 63
2x^2 + 6x + 3x + 9 -2x^2 = 63
9x + 9 = 63
9x = 63 - 9 = 54
x = 54/9
x = 6 unidades
El largo es 2x = 12 unidades