Question

1) 5 – 3х = -7х – 9;
2) 3а+1=3а-1;
3) в-9=в-9;
4) – (14 -21х) = 56;
5) 3(6х-1) = 2(9х+1) – 10

6) │5х + 1│= - 4;
7) │21х + 2│ = 23;
8) │10х - 1│ = 0;


Срочно! помогите!