Explicación paso a paso:
25+4-(7×3+(18×5-12÷3-15)-28×3)
29-(21+(90-4-15)-84)
29-(21+ 71-84)
29-8
21
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Explicación paso a paso:
25+4-(7×3+(18×5-12÷3-15)-28×3)
29-(21+(90-4-15)-84)
29-(21+ 71-84)
29-8
21