Что значит уровнение с неизвестным​

это когда,в уравнение есть одно или более неизвестных чисел,как правило их пишут через х

это когда,в уравнение есть одно или более неизвестных чисел,как правило их пишут через х

London often gives the impression of being more comfortable with its past that its present. from the world-famous landmarks of st. paul’s cathedral, buckingham, palace and the tower of london to the traditional and well-loved double-decker buses, the theatres and many grand hotels, england’s capital offers visitors a journey through centuries of history. this journey is even better now that the building works, which covered many historic sites, have been taken down. newly cleaned and restored buildings are revealed, and the city looks as if it has been revitalized.the city has its won historic delights as the 15th century guildhall and churches designed by sir christopher wren. but the capital is not a historical theme park. much of london’s energy and originality is now centred in soho, the city’s liveliest and most bohemian area, squeezed in between the department stores of oxford street and the bookshops of charing cross road. soho, once considered one of the dirtiest and most dangerous parts of london, was cleaned up in the early 1980’s. today, with its gurgling cappuccino machines and pavement cafes, it has become a meeting place for all kinds of people from all over the world, whatever the hour of day or night. so, even if you are new to the city, you don’t have to try hard in order to experience the real london. despite its heavy traffic and shaking underground railway, it is still one of the world’s greatest and most cosmopolitan cities