1) (0.1-х):0.106=0.67
2) 0.78 умножить (х+0.2)=3.9

1. ( 0.1 -x) : 0.106 = 0.670.1-x = 0.67*0.670.1 - x = 0.07102x = 0.1-0.07102x = 0.028982. 0.78*(x+0.2) = 3.9x + 0.2 = 3.9 : 0.78 x + 0.2 =  5x = 5 - 0.2x = 4.8