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resolver para x:
2 x - 4 = 0
añadir 4 a ambos lados:
2 x + (4 - 4) = 4
4 - 4 = 0:
2 x = 4
(2 x)/2 = 4/2
2/2 = 1:
x = 4/2
x = 2
Respuesta
x = 2