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<response><unit><id>36efe03a-0fb2-45e1-ad7e-75074c78d1db</id><parent_id>159a172c-a481-4d66-8e43-cd9e2b23fb02</parent_id><number>4.7.4</number><names>[{"lang":"es","name":"Resolver una ecuación exponencial por cambio de variable"},{"lang":"en","name":"Solving an exponential equation by variable change"},{"lang":"ca","name":"Resoldre una equació exponencial per canvi de variable"}]</names><difficulty>7</difficulty><created>18/7/16 11:43</created><modified>18/7/16 11:43</modified></unit></response>
