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4 - 2x = 2 + x
4 - 2 = x + 2x
2 = 3x
2 / 3 = x
2( 2 - x) = 2 + x
4 - 2x = 2 + x
4 - 2 = x + 2x
2 = 3x
2/3 = x
x = 2/3
Respuesta.
x = 2/3