Question

1.7x+21+3.1x=57 помогите пожалуйста

Answer 1

 1,7x+3,1x=57-21

4,8x=36

x=36/4,8 

x=7,5 

Answer 2

1.7x+21+3.1x=57

1,7х+3,1х=57-21

4,8х= 36

х=36/4,8

х= 7.5