Question

помогите паж матешу. ​

Answer 1

(31*550-х)*120=10200

31*550-х=10200/120

17050-х=85

х=17050-85

х=16965

проверка

(31*550--16965)*120=10200

(17050-16965)*120=10200

85*120=10200

10200=10200

Ответ х=16965

Answer 2

$(31 \times 550 - x) \times 120 = 10200 \\ (17050 - x) \times 120 = 10200 \\ 2046000 - 120x = 10200 \\ - 120x = 10200 - 2046000 \\ - 120x = - 2035800 \\ x = 16965$