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12x14=168 12+14=26 168-26=142
Número par 2x
El número par siguiente: 2x + 2
2x(2x + 2) = 2x + 2x + 2 +142
4x² + 4x = 4x + 144
4x² + 4x - 4x = 144
4x² = 144
x² = 144/4
x² = 36
x = √36
x= 6
2x = 2·6= 12
2x + 2 = 2·6 + 2= 12 + 2 = 14