4,7y-(2,5y+12,4)=19
4.7y – 2.5y – 12.4 = 19
4,7y – 2,5y = 19 + 12,4
2.2y = 31.4
22y = 314
11y = 157
y = 157/11
у=14,2727272727
4,7y-(2,5y+12,4)=19
4.7y – 2.5y – 12.4 = 19
4,7y – 2,5y = 19 + 12,4
2.2y = 31.4
22y = 314
11y = 157
y = 157/11
у=14,2727272727