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2x + 7 = 13
2x = 13 - 7
2x = 6
x = 6/2
x = 3
2x - (- 9) =
2 * 3 - (- 9) =
6 - (- 9) = Aplicas ley de signos para quitar parentesis
- por - = +
6 + 9 =
15
Respuesta.
15