Question

срочно! даю 50 баллов​

Answer 1

1) (2(3a-4b)-4(b+5))/2=4

6а-8b-4b-20=4

6a-8b-4b=4+20

6a-12b=24

6a-12b-24=0 / :6

a-2b-4=0

2) 3(8b-5)-(7-2a)=-42

24b-15-7+2a=42

24b+2a=42+15+7

24b+2a=64

24b+2a-64=0 / :2

12b+a-32=0