Problem #PRU-103812

Problems Teoría de Números Operaciones Aritméticas. Identidades Numéricas Matemáticas Discretas Teoría de Conjuntos y Lógica Lógica Matemática Rompecabezas
 11–11  2.0

Problem

Alex laid out an example of an addition of numbers from cards with numbers on them and then swapped two cards. As you can see, the equality has been violated. Which cards did Alex rearrange?

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