Odpowiedź:
a) 9x - 5 = 8x + 8
9x - 8x = 8 + 5
x = 13
b) 4x - 5 - 8x - 15 = 4
4x - 8x = 4 + 5 +15
-4x = 24 / * (-1)
4x = -24 /:4
x = -6
c) 3(x+5) +2x = x - 1
3x + 15 +2x = x - 1
3x + 2x - x = - 1 - 15
4x = -16 /:4
x = -4
d) -2(x + 5) - (5x - 4) = 4x + 1
-2x - 10 - 5x + 4 = 4x + 1
- 2x - 5x - 4x = 1 + 10 - 4
- 11 x = 7 /* (- 1)
11 x = -7 /: 11
x = - 7/11
