Hej!
6x + 4 = 2x
6x - 2x = -4
4x = -4 / : 4
x = -1
3x - 4 = 5x
3x - 5x = 4
-2x = 4 / : (-2)
x = -2
-2x + 7 = 6x - 9
-2x - 6x = -9 - 7
-8x = -16 / : (-8)
x = 2
2x = 7x + 18
2x - 7x = 18
-5x = 18 / : (-5)
x = -3,6
-4x + 5 = 25 - 9x
-4x + 9x = 25 - 5
5x = 20 / : 5
x = 4
Pozdrawiam! - Julka