Question

9*(х-5)+4*(6-х)=3+3*(х+20)-2х

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(х-5)+4(6-х)=3+3(х+20)-2х
9х-45+24-4х=3+3х+60-2х
9х-4х-3х+2х=3+60+45-24
4х=84
х=84:4
х=21
проверка
9(21-5)+4(6-21)=84
3+3(21+20)-2*21=84
84=84