уравнение
5\7*(12,6-2,8х)=3,6*(5\9-3\4х)
6-2х=2-1,8х
- 2х+1,8х=2 - 6
-0,2х= -4
х=20
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уравнение
5\7*(12,6-2,8х)=3,6*(5\9-3\4х)
6-2х=2-1,8х
- 2х+1,8х=2 - 6
-0,2х= -4
х=20