Odpowiedź:
a)
8 + 5 * x + 2 = - 3 * x + 7 + 2 * x
8 + 5x + 2 = - 3x + 7 + 2x
10 + 5x = - x + 7
5x + x = 7 - 10
6x = - 3
x = - 3/6 = - 1/3
b)
3x - 4 + 2x = 7x - 5 + x
5x - 4 = 8x - 5
5x - 8x = - 5 + 4
- 3x = - 2
3x = 2
x = 2/3
c)
x - 2x + 3x - 4x + 5x - 6x + 7x - 8x + 9x - 10x + 11x = 6
x + 5x = 6
6x = 6
x = 6/6 = 1
d)
x + 3x + 5x + 7x + 9x + 11x + 13x + 15x + 17x + 19x - 25 = 50
100x - 25 = 50
100x = 50 + 25 = 75
x = 75/100 = 3/4
