Explicación paso a paso:
[tex]7( - 1 - 2 ) = 7( - 1) - 7(2) = - 7 - 14 = - 21[/tex]
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Explicación paso a paso:
[tex]7( - 1 - 2 ) = 7( - 1) - 7(2) = - 7 - 14 = - 21[/tex]