Hej!
5x = 7 - 2x
5x + 2x = 7
7x = 7 / : 7
x = 1
3 - 10x = 9 - 4x
-10x + 4x = 9 - 3
-6x = 6 / : (-6)
x = -1
-6 + 4x = 5x + 4
4x - 5x = 4 + 6
-x = 10 / : (-1)
x = -10
Pozdrawiam! - Julka