52х + 8х = 12300
60х = 12300
х = 12300 : 60
х = 205
Проверка: 52 * 205 + 8 * 205 = 10660 + 1640 = 12300
52 * X+8 * X=12300
60*х=12300
х=12300/60
х=205
52х + 8х = 12300
60х = 12300
х = 12300 : 60
х = 205
Проверка: 52 * 205 + 8 * 205 = 10660 + 1640 = 12300
52 * X+8 * X=12300
60*х=12300
х=12300/60
х=205