(( 3х - 54 ) * 8 - 159) : 21 = 21

Question

(( 3х - 54 ) * 8 - 159) : 21 = 21

Answer 1

(3х-54)*8-159=21*21
(3х-54)*8-159=441
(3х-54)*8=441+159
(3х-54)*8=600
3х-54=600:8
3х-54=75
3х=75+54
3х=129
х=129:3
х=43