X-2/36=5/12. x-5/23=36/92. 4/3x-11=36/63

1 (выравниваем знаменатель)
х-2/36=15/36
х=15/36+2/36
х=17/36

2:
х-20/92=36/92
х=36/92+20/92
х=56/92=14/23

3:
4/3х=36/63+11
4/3х=36/63+63/63
4/3х=99/63
3х=4:99/63
3х=252/63:99/63
3х=252/99
х=252/99:3
х=252/297=28/33