4,7x - (2,5x + 12,4) = 19
4,7x - 2,5x - 12,4 = 19
2,2x = 19 + 12,4
2,2x = 31,4
x = 31,4 / 2,2
x = 314/22
x = 157/11
4,7x - (2,5x + 12,4) = 19
4,7x - 2,5x - 12,4 = 19
2,2x = 19 + 12,4
2,2x = 31,4
x = 31,4 / 2,2
x = 314/22
x = 157/11