Respuesta:
20
Explicación paso a paso:
7x - 19 = 5x + 21
7x - 5x = 21 + 19
2x = 40
x = 40/2
x= 20
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Respuesta:
20
Explicación paso a paso:
7x - 19 = 5x + 21
7x - 5x = 21 + 19
2x = 40
x = 40/2
x= 20