19,48-(х+7,4)=3,125
раскрываем скобки 19,48-х-7,4=3,125
19,48-7,4-3,125=х
х=8,955
проверка: 19,48-(8,955+7,4)=3,125
19,48-16,355=3,125
3,125=3,125
7/2 + (4/9)*х = 2/18
7/2 -2/18 = (4/9)*х
63/18 - 2/18 = (4/9) *х
(4/9)*х = 61/18
х = 61/18 / 4/9
х = 61/22
X-83+316=425
x=425-316+83
x=192
- - - - - - -111:3=37- - - - - - -