504х = 2871 - 1983504х = 888x = 888 / 504x = 1.76
7x + 3x - 6x = 204x = 20x = 5
Ответ: x = 1.76, x = 5.
504х = 2871 - 1983
504х = 888
x = 888 / 504
x = 1.76
7x + 3x - 6x = 20
4x = 20
x = 5
Ответ: x = 1.76, x = 5.