6x + 3x - x = 64008x - x = 64007x = 6400x = 6400 / 7x = 914.2857142857
4x + 5x - x = 12008x - x = 12007x = 1200x = 1200 / 7x = 171.4285714286
Ответ: x = 914.2857142857; x = 171.4285714286
6x + 3x - x = 6400
8x - x = 6400
7x = 6400
x = 6400 / 7
x = 914.2857142857
4x + 5x - x = 1200
8x - x = 1200
7x = 1200
x = 1200 / 7
x = 171.4285714286
Ответ: x = 914.2857142857; x = 171.4285714286