Question

Реши уравнение (300-х)*5=210

Answer 1

(300 - х ) * 5 = 210
300 * 5 - 5х = 210
1500 - 5х = 210
1500 - 210 = 5х
5х = 1290
х = 1290 : 5
х = 258

проверка:
(300 - 258) * 5 = 42 * 5 = 210.. 210 = 210