Question

x•9=130+140 x:8=200-120 164-x=720:9
помогите срочно!

Answer 1

9х=270
х=30
30*9=130+140
270=270

х:8=80
х=640
640:8=200-120
80=80

164-х=720:9
164-х=80
х=164-80
х=84
164-84=720:9
80=80