1)0.6-1.6(х-4)=3(7-0.4х)      2)8х-1.1=3х+1.4    3)17+1.2(х+1)=9+1.1х      4)5.6-3(2-0.4)=0.4(4х+1)

0.6-1.6x+6.4=21-1.2x           8x-1.1=3x+1.4
-1.6x+1.2x=21-7                   8x-3x=1.4+1.1
-0.4x=14                                5x=2.5
-x=35                                     x=0.5
x=-35