1) -5*7-30= 7х-10=20 8х=-64 -70-50+35 -100х-10=100

-35 -30 = - 65
7х = 20+10 ;  7х = 30;  х = 30/7 ;    х = 4 целых 2/7
84х = - 64;  х = - 8
-70 -50 +35 = - 85
-100х = 100+10;  -100х = 110;    х = - 1,1