Odpowiedź:
a)
3 -x = 2x + 1
- x - 2x = 1 - 3
- 3x = - 2
3x = 2
x = 2/3
sprawdzenie
3 - 2/3 = 2 * 2/3 + 1
2 1/3 = 4/3 + 1
2 1/3 = 1 1/3 + 1
2 1/3 = 2 1/3
L = P
b)
5x - 5 = 16 - 2x
5x + 2x = 16 + 5
7x = 21
x = 21/7 = 3
sprawdzenie:
5 * 3 - 5 = 16 - 2 * 3
15 - 5 = 16 - 6
10 = 10
L = P
c)
1/2x + 3 = x - 3
1/2x - x = - 3 - 3
- 1/2x = - 6
1/2x = 6
x = 6 : 1/2 = 6 * 2 = 12
sprawdzenie:
1/2 * 12 + 3 = 12 - 3
6 + 3 = 9
9 = 9
L = P