Вопрос по математике:

При каком значении x разность выражений равна 0?

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Вопрос по английскому языку:

Помогите пожалуйста этот текст нужно зделать в прошедшем времени.

Hi, my name is Marina Smirnova. I’m 12 years old and I live in the beautiful town of St Petersburg. My daily routine is typical of most students my age.

I get up at 7:00 am and after a quick breakfast I walk to school. School starts at 8:00 am and finishes at 2:00pm from Monday to Friday. There are 30 students in my class and every day we have 6−7 lessons. Each lesson lasts 45 minutes with a 10−minute break in between. My favourite lessons are history and maths. They are both very interesting. We have lunch in the school canteen during the longer break in the afternoon. We have many exciting things to do at school after classes. On Tuesday and Thursday I have guitar lessons.

Вопрос по химии: