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7 - (3) = 16 - 12
7 - 3 = 4
4 = 4 ...... Sí son iguales
29 + 9(35/(-5)) = 29 + 35/(-5)
29 +9(-7) = 29 + (-7)
29 - 63 = 29 - 7
-34 = 22 .......No son iguales
7-(12-9)
7-(3)
7-3
=4
7-12+9
-5+9
=4
estas igualdades son ciertas
29+9[35/(-5)]=29+35/(-5)
29+9(-7)
29-63
=-34
29+35/(-5)
29-7
=22
estas igualdades no son ciertas