Odpowiedź:
1)
5x - 3(6 - 8x) = x - 7(x + 4)
5x -18 + 24x = x - 7x - 28
29x - 18 = - 6x - 28
29x + 6x = - 28 + 18
35x = - 10
x = - 10/35 = - 2/7
2)
3(2x + 3) - 5(x - 2) - 4(x + 7) = 3
6x + 9 - 5x + 10 - 4x - 28 = 3
- 3x - 9 = 3
- 3x = 3 + 9 = 12
3x = - 12
x = - 12/3 = - 4\
3)
- (2x - 1)/9 + (4x - 5)/15 = x - 5 | * 45
- 5(2x- 1) + 3(4x - 5) = 45(x - 5)
- 10x + 5 + 12x - 15 = 45x - 225
2x - 10 = 45x -225
2x - 45x = - 225 + 10
- 43x = - 215
43x = 215
x= 215/43 = 5
4)
(4 - x)/3 =(x + 6)/2
2(4- x) = 3(x + 6)
8 - 2x = 3x + 18
- 2x - 3x = 18 - 8
- 5x = 10
5x = - 10
x = - 10/5 = - 2
5)
5(x - 2)/3 = (5x - 20)/4
4 * 5(x - 2) = 3(5x- 20)
20(x - 10) = 15x - 60
20x - 200 = 15x - 60
20x - 15x = - 60 + 200
5x = 140
x = 140/5 = 28
