Respuesta:
es 20 :3
Explicación paso a paso:
3x - 21 = 39
3x = 39 + 21
3x = 60
x = 20
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Respuesta:
es 20 :3
Explicación paso a paso:
3x - 21 = 39
3x = 39 + 21
3x = 60
x = 20