(5,12+x)*0,14=8,4 2,472: (30-y)=0,12 (x-4,7)*3,4=12,92 12,7-4,5x=8,29

(5,12+x)*0,14=8,4
0,7168 + 0,14x = 8.4
0.14x = 7.6832
x = 54. 88

(x-4,7)*3,4=12,92   
x - 4.7 = 12,92 : 3.4
x - 4.7 = 3.8
x = 8.5

12,7-4,5x=8,29
4,5x = 12.7 - 8.29
4.5x = 4.41
x = 0.98

2,472:(30-y)=0,12
30 - y = 2.472 : 0,12
30 - y = 20.6
y = 9.4