Use both hands to pull a spring scale with 10N force at the same time, why is the indication still 10N? I don't understand that. Who knows? Explain

This is the force acting on the reaction force. Let's take an example. Suppose that the spring scale is fixed on the wall now, and you use one hand to pull it. With a force of 10N, the indication on the spring scale must be 10N, and now the wall is also subject to a tension of 10N, right? At this time, you can imagine the wall as your other hand

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