bonjour pouvez-vous m'aider svp a) 2(x + 1) + 3(x - 1) = 0. b) 2x +1-(4-x) = 5x -2 c) 3(x - 1) - 5(2 – 3x) = 5​

bonjour

2 ( x + 1 ) + 3 ( x - 1 ) = 0

2 x + 2 + 3 x - 3 = 0

5 x = 3 - 2

5 x  = 1

x =  1/5

2 x + 1 -  ( 4 - x ) = 5 x - 2

2 x + 1 - 4 + x = 5 x - 2

2 x + x - 5 x = - 2 - 1 + 4

-  2 x = 1

x = - 1 /2

3 ( x - 1 ) - 5 ( 2 - 3 x )  = 5

3 x - 3 - 10 + 15 x = 5

18 x = 5 + 3 + 10

18 x = 18

x = 1

Bonjour,

2(x + 1) + 3(x - 1) = 2 * x + 2 * 1 + 3 * x + 3 * -1 = 2x + 2 + 3x - 3 = 5x - 1

donc 5x - 1 = 0

5x = 0 + 1

5x = 1

x = 1/5

2x + 1 - (4 - x) = 5x - 2

2x + 1 - 4 + x = 5x - 2

2x - 5x + x = - 2 - 1 + 4

-2x = 1

x = -1/2

3(x - 1) - 5(2 - 3x) = 5

3 * x + 3 * -1 - 5 * 2 - 5 * - 3x = 5

3x - 3 - 10 + 15x = 5

18x - 13 = 5

18x = 5 + 13

18x = 18

x = 18/18 = 1