<span>(5,12+x)*0,14=8,4
0,7168 + 0,14x = 8.4
0.14x = 7.6832
x = 54. 88
</span><span>(x-4,7)*3,4=12,92
</span>x - 4.7 = 12,92 : 3.4
x - 4.7 = 3.8
x = 8.5
<span>12,7-4,5x=8,29
</span>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