9*(x-5)+4*(6-X)=3+3*(X+20)-2X

Question

9*(x-5)+4*(6-X)=3+3*(X+20)-2X

Answer 1

9*(x-5)+4*(6-X)=3+3*(X+20)-2X

9х-45+24-4х=3+3х+60-2х

5х-21=х+63

5х-х=63+21

4х=84

х=84/4

х=21

Answer 2

9*(x-5)+4*(6-x)=3+3*(x+20)-2x

9x-45+24-4x=3+3x+60-2x

9x-4x-3x+2x=3+60+45-24

4x=84

x=21

 

Проверка:

9*(21-5)+4*(6-21)=3+3*(21+20)-2*21

9*16+4*(-15)=3+3*41-2*21

144-60=3+123-42

84=84