№1) а)
2.8х - 3.6 = 3.7х
2.8х - 3.7х = 3.6
-0.9х = 3.6
х = - 4
б) 3 (2.1 - 1.2х) = 3.1 - 3.2х
6.3 - 3.6х =3.1 - 3.2х
-3.6х - 3.2х = 3.1 - 6.3
-0.4х=-3.2
х=8
№2) -
№3) 1)
5.6-3(2-0.4х)=0.4(4х+1)
5.6 - 6 + 1.2х = 1.6х + 0.4
-0.4 +1.2х = 1.6х + 0.4
1.2х - 1.6х = 0.4 + 0.4
-0.4х = 0.8
х= - 2
2)
2(х+2) = 9(х-3)
2х + 4 = 9х - 27
2х - 9х = - 27 - 4
-7х = - 31
х= - 31/7
№4) -
№5)