Решите уравнение 6,4(y-12,8)=3,2 пожалуйста помогите . Заранее спасибо

Open the brackets, using the correct form of a verb.

1) By the end of this month I ___(to finish) reading "Robinson Crusoe" , then you ___(to read) it, and I ___(to begin) "David Copperfield"

2) If you do not make a note of it, you __ (to forget) it by tomorrow. 

3) By this time next year I ____ (to graduate) from Moscow state University and ___ (to be) in Saint Petersburg.

4) I ___ (to get) through the greater part of the work when y come.