Question

(16+3х)*3=129 пж мне срочно

Answer 1

(16+3х)*3=129
48+9х=129
9х=129-48
9х=81
х=81:9
х=9

Answer 2

(16+3х)*3=129 | :3
16+3x = 43
3x = 43-16
3x = 27 | :3
x = 9