Question

Срочно решите
Просто ответы
21-4d=42+3d

5y-9=-81-4y

3 (c+3)+21=60

24-3 (a-8)=18

Answer 1

1) 21-4d=42+3d

-4d-3d=42-21

-7d=21

d=-3

2)5y-9= -81-4y

5y+4y= -81+9

9y= -72

y= -8

3) 3(c+3)+21=60

3c+9+21=60

3c+30=60

3c=30

c=10

4)24-3(a-8)=18

24-3a+24=18

48-3a=18

-3a = -30

a=10