Let’s connect two electroscope with a conductor and bring a charged stick to them. The leaves of the electroscope will disperse, indicating that they have a charge. Then remove the conductive jumper and remove the stick. If we now reconnect the electroscope with a conductor, the charges neutralize each other. This means that the charges of the electroscope were equal in magnitude and opposite in sign.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.