3+0,6*(х+7)=1,3-0,5*(х-3) 3/7-1/4х=5 3/7-4х !

3+0.6х+4.2=1.3-0.5х+1.5
0.6х+0.5х=1.5-3-4.2
1.1х=-5.7
х=-5.7:1.1=-57/10:11\10=57/10*10/11
х=-57/11=-5 2\11

3\7-1\4х=5 3\7-4х
-1\4х+4х=5 3\7-3\7
3 3\4х=5
х=5:15/4=5*4/15
х=4\3=1 1\3