6х-3+7х-35 = 16+3-6х

13х-38 = 19 -6х

13х + 6х = 38 + 19

19х = 57

х = 57:19
х=3 

6х-3+7х-35=16+3-6х

6х+7х+6х=16+3+3+35

19х=57

х=57:19

х=3