3/(2х+1) = 4/(х-13)
3(х-13)=4(2х+1)
3х-39=8х+4
8х-3х= - 39- 4
11х= - 43
х= - 43/11
х= - 3 10/11
1) 4,6Х+5,75х(Х+25,32)=588,87
4,6Х+5,75Х+145,59=588,87
80Х=588,87-145,59
80Х=443,28
Х=443,28:80
Х=5,541
2)5,75х(Х+25,32)-4,6Х=194,81
5,75Х+145,59-4,6Х=194,81
5,75Х-4,6Х=194,81-145,59
1,15Х=49,22
Х=49,22:1,15
Х=42,8