4) (x-3)/4 + (x-4)/3 - (x-5)/2 = (x-1)/8
(6x - 18 + 8x - 32 - 12x + 60)/24 = (3x - 3)/24
2x + 10 = 3x - 3
x = 13
5) (7+9x)/4 + (2-x)/9 = 7x + 1
(63 + 81x + 8 - 4x)/36 = (252x + 36)/36
71 + 77x = 252x + 36
175x = 35
x = 1/5
6) 5(x+5) + 3(x+2) - 7(x+6) = x
5x + 25 + 3x + 6 - 7x - 42 = x
x - 11 = x
0 = 11 (нет решений)
7) 5(x+5) + 3(x+2) - 7(x+31/7) = x
5x + 25 + 3x + 6 - 7x - 31 = x
x = x (тождество: решение - любое x)
4) (x-3)/4 + (x-4)/3 - (x-5)/2 = (x-1)/8
(6x - 18 + 8x - 32 - 12x + 60)/24 = (3x - 3)/24
2x + 10 = 3x - 3
x = 13
5) (7+9x)/4 + (2-x)/9 = 7x + 1
(63 + 81x + 8 - 4x)/36 = (252x + 36)/36
71 + 77x = 252x + 36
175x = 35
x = 1/5
6) 5(x+5) + 3(x+2) - 7(x+6) = x
5x + 25 + 3x + 6 - 7x - 42 = x
x - 11 = x
0 = 11 (нет решений)
7) 5(x+5) + 3(x+2) - 7(x+31/7) = x
5x + 25 + 3x + 6 - 7x - 31 = x
x = x (тождество: решение - любое x)