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12.
Análisis.
Sí sabemos qué:
X = 3.
Entonces cuánto es:
3x + 2 + 1
Calculamos 3x:
3x =
3x + 3 =
3 × 3 =
9
Entonces:
9 + 2 + 1 =
11 + 1 =
12
Entonces,
3x + 2 + 1 =
9 + 2 + 1 =
11 + 1 =
12
Saludos Cordiales.