1.) 10.5-(2х-3)=4.2 2)17.2а-3+1.5а=17.2*10-3+1,5*10=172-3+15=184
10.5-2х+3=4.2
2х=10.5+3-4.2
2х=9.3
х=4.65
1.) 10.5-(2х-3)=4.2 2)17.2а-3+1.5а=17.2*10-3+1,5*10=172-3+15=184
10.5-2х+3=4.2
2х=10.5+3-4.2
2х=9.3
х=4.65