2(х+11,3)=54,2. 3(х-2,9)=6,9 (68,37-у): 6,15=8,2 (х+5,7): 5,1=2

1) 2х+22,6=54,
2х=54-22,6
2х=31,4
х=15,7
2) 3х-8,7=6,9
3х=6,9+8.7
3х=15.6
х=5.2
3)68.37-у=6.15×8.2
68.37-у=50,43
у= 68.37-50.43
у=17,94
4) х+5.7=2×5,1
х+5.7=10.2
х=10.2-5.7
х=4.5