1) -1.4(х-6)=7(4х+1.2)
-1.4х-6*(-1.4)=7*4х+1.2*7
-1.4х-(-8,4)=28х+8,4
-1,4х+8,4=28х+8,4
-1,4х-28х=8,4-8,4
-29,4х=0
х=0
2) 2.6(0.4-1.4)=-3.9(1.2х-0.9)
2.6*0.4-2.6*1.4=-3.9*1.2х-(-3.9)*(-0,9)
1.04-3.64=-4.68х-3.51
-2.6=-4.68х-3.51
-2.6+3.51=-4.68х
0.91=-4.68х
0.91/4.68=-х
х=-0.19(4)