0,45a=1/3a+7
0.45a-1/3a=7
45/100*a-1/3*a=7
135/300*a-100/300*a=2100/300
35a=2100
a=60
Проверка
0,45*60=27
1/3*60+7=27
27=27
ответ:60
0,45a=1/3a+7
0.45a-1/3a=7
45/100*a-1/3*a=7
135/300*a-100/300*a=2100/300
35a=2100
a=60
Проверка
0,45*60=27
1/3*60+7=27
27=27
ответ:60