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3X+3=69
3X=66
X=22
x+ (x + 1) + (x + 2) = 69
x + x + 1 + x + 2 = 69
3x + 3 = 69
3x = 69 - 3
3x = 66
x = 66/3
x = 22
Respuesta.
x = 22