at our lessons we answer the teacher's questions.
in england they don't go to school every day.
i do my homework in my bedroom.
the pupils on duty tidy the classroom.
all the pupils have to wear uniforms.
i come to school at a quarter to eight.
we like to make reports.
i do me homework every day.
i have my music lessons two times a week.
we have english three times a week.
this magazine is published to times a month.
i visit my aunt three times a month.
i never miss classes.
i go to the forest very often.
they seldom go to the theatre.
7 · (3x + 4) - 5 · (5x - 1) = 11
21x + 28 - 25x + 5 = 11
Известные величины переносим в правую часть уравнения и при этом не забываем менять знаки на противоположные.
21x - 25x = 11 - 5 - 28
-4x = -22
x = (-22) : (-4)
x = 5,5
ответ: 5,5.