Explicación paso a paso:
3m + 29 - 38 = 21 + 45
3m-9=66
3m=66+9
3m=75
m=75/3
m=25
b)
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Explicación paso a paso:
3m + 29 - 38 = 21 + 45
3m-9=66
3m=66+9
3m=75
m=75/3
m=25
b)