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x=2y
2x+2y=42
sustituimos x=y,en la segunda ecuacion
2x+2y=42
2(2y)+2y=42
4y+2y=42
6y=42
y=42/6
y=7
si y=7.......x=2y....x=2(7)......x=14
x=14 y=7
el largo mi de 14 cm y el ancho mide 7 cm