Question

1)16,4 - 5,4*x=14,78
2)10,2*x-7,4*x+0,88=2
3)0,6*y+0,18*y-2,376=5,58

Answer 1

Вот так просто решать 

Answer 2

1) 16.4-5.4х=14.78
-5.4х=14.78-16.4
5.4х=1.62
Х= 0.3

2) 10.2х-7.4х+0.88=2
2.8х=2-0.88
2.8х=1.12
Х=0.4

3) 0.6у+0.18у-2.376=5.58
0.78у=5.58+2.376
0.78у=7.956
У=10.2