2)0,1х+2х+3,15 = 5,5125

3)4а +15а -3,4 =54,74

2)0,1х+2х+3,15=5,51252,1х=5,5125-3,152,1х=2,3625х=1,1253)4а+15а-3,4=54,7419а=54,74+3,419а=58,14а=3,06