a) 6x + 4 = 2x | - 4
6x = 2x - 4 | - 2x
6x - 2x = - 4
4x = - 4 | : 4
x = -1
b) 3x - 4 = 5x | +4
3x = 5x + 4 | -5x
3x - 5x = 4
-2x = 4 | : (-2)
x = -2
c) -2x + 7 = 6x - 9 | -7
-2x = 6x - 9 - 7 | -6x
-2x -6x = -9 - 7
-8x = -16 | : (-8)
x = 2
d) -2x = 7x + 18 | -7x
-2x - 7x = 18
-9x = 18 | : (-9)
x = -2
e) -4x + 5 = 25 - 9x | - 5
-4x = 25 - 9x - 5 | +9x
-4x + 9x = 25 - 5
5x = 20 | : 5
x = 4
Mam nadzieję, że pomogłam.
