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Sagot :

Bonsoir

c) 4x -1 = 5x + 3

4x - 5x = 3 + 1

- x = 4

x = - 1

d) 2/5 - 1/2x = -x - 2

- 1/2x + x = - 2 - 2/5

- 1/2x + 2/2x = - 10/5 - 2/5

1/2x = - 12/5

5x = - 24

x = - 24/50

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