1.
х+х+1+х+4=18
3х+5=18
3х=18-5
3х=13
х=13/3
х=4целых 1/3
2.
21+10-4х-10+3х=0
-х+21=0
-х=-21
х=21
3.
х=537-109
х=428
4.
-у/10 - у/5 = -12
-у/10 - 2у/10 = -12
-3у/10 = -12
3у= 12*10
3у=120
у=40
1.
х+х+1+х+4=18
3х+5=18
3х=18-5
3х=13
х=13/3
х=4целых 1/3
2.
21+10-4х-10+3х=0
-х+21=0
-х=-21
х=21
3.
х=537-109
х=428
4.
-у/10 - у/5 = -12
-у/10 - 2у/10 = -12
-3у/10 = -12
3у= 12*10
3у=120
у=40