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Sumando peras y manzanas
To calculate the value of pear and apple from 2 purchases.
About mental arithmetic, with a pre-algebra tool introducing the Gaussian elimination.
Version in Spanish. In spanish is necessary to change oranges for pears.
In spanish the quote is "You can't add pears and apples" (No se pueden sumar peras y manzanas)
Para calcular el valor de una pera y una manzana a partir de dos compras....
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