Question

1 ,5 х + 9 = 4,5 х - 21

Answer 1

1,5x+9=4,5x-21

9+21=4,5x-1,5x

30=3x

3x=30

x=30:3

x=10

Ответ:x=10

Answer 2

21+9=4,5х-1,5х
30=3х
х=30÷3
х=10