Ответы и объяснения

2013-12-18T00:10:07+04:00
(97+75:(50-5х))•3=300
(97+75:(50-5х))=300:3
(97+75:(50-5х))=100
75:(50-5х)=100-97
75:(50-5х)=3
(50-5х)=75:3
(50-5х)=25
5х=50-25
5х=25
Х=25:5=5