(31*550-х)*120=10200 помогите

Question

(31*550-х)*120=10200 помогите

Answer 1

(31×550-х)*120=10 200
(17050-х)*120= 10200
17050-х = 10200:120
17050-х = 85
х = 17050-85
х = 16 965
----------------- (31×550-16965)×120=10200
10200 = 10200.