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6 - [(7 + 5) ÷4] =
6 - [12 ÷ 4] =
6 - [ 3 ] = Para quitar parentesis aplicas ley de signo - por + = -
6 - 3 =
3
[73 - (32 - 8) ] ÷ 7 =
[73 - ( 24)] ÷ 7 = Para quitar parentesis aplicas ley de signo - por + = -
[73 - 24] ÷ 7 =
[49]÷ 7 =
7