[tex] - 3 \times + 1 = 28 \\ - 3 \times = 28 - 1 \\ - 3 = 27 \\ \times = - 9[/tex]
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[tex] - 3 \times + 1 = 28 \\ - 3 \times = 28 - 1 \\ - 3 = 27 \\ \times = - 9[/tex]
con la cual al ultimo vas a dividir 27%3 sale = 9.
saludos.