Explicación paso a paso:
x= m+3
2(m+3)+9
2m+6+9
2m+15
x=m
2(m)+9
2m+9
2m+15-(2m+9)
6
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Explicación paso a paso:
x= m+3
2(m+3)+9
2m+6+9
2m+15
x=m
2(m)+9
2m+9
2m+15-(2m+9)
6