Sagot :
a) 5 - (x - 3) = 4x - (3x - 8)
5 - x + 3 = 4x - 3x + 8
8 - x = x + 8
- x -x = 8 - 8
- 2x = 0
x = \frac{0}{-2}
x = 0.
b) 7(x + 4) - 3(x + 2) = x + 7
7 x x + 7 x 4 - 3 x x - 3 x 2 = x + 7
7x + 28 - 3x - 6 = x + 7
4x + 22 = x + 7
4x - x = 7 - 22
3x = - 15
x = \frac{-15}{3}
x = - 5.
c) 2(x - 1) - 3(x + 1) = 4(x - 2)
2 x x + 2 x (-1) - 3 x x - 3 x 1 = 4 x x + 4 x (-2)
2x - 2 - 3x -3 = 4x - 8
- x - 5 = 4x - 8
-x - 4x = - 8 + 5
- 5x = - 3
x = \frac{-3}{-5}
x = \frac{3}{5}
5 - x + 3 = 4x - 3x + 8
8 - x = x + 8
- x -x = 8 - 8
- 2x = 0
x = \frac{0}{-2}
x = 0.
b) 7(x + 4) - 3(x + 2) = x + 7
7 x x + 7 x 4 - 3 x x - 3 x 2 = x + 7
7x + 28 - 3x - 6 = x + 7
4x + 22 = x + 7
4x - x = 7 - 22
3x = - 15
x = \frac{-15}{3}
x = - 5.
c) 2(x - 1) - 3(x + 1) = 4(x - 2)
2 x x + 2 x (-1) - 3 x x - 3 x 1 = 4 x x + 4 x (-2)
2x - 2 - 3x -3 = 4x - 8
- x - 5 = 4x - 8
-x - 4x = - 8 + 5
- 5x = - 3
x = \frac{-3}{-5}
x = \frac{3}{5}