Respuesta:
139
Explicación paso a paso:
* 2x + 42 = 340 - 20
2x + 42 = 320
2x = 278
x = 139
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Respuesta:
139
Explicación paso a paso:
* 2x + 42 = 340 - 20
2x + 42 = 320
2x = 278
x = 139