Решите уравнение: 1,8:6,8=0,042:7/6x+0,042

18/10:68/10=42/1000*6/7x+42/1000

18/10*10/68=6/500*3x+21/500

9*1/34=3/250*3x+21/500

9/34=9/250x+21/500

8500*9/250*9/250x+8500*21/500

250*8=34*9x+17*21

2250=306x+357

-306x=-1893

x=1893/306

x=631/102