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3x+5 = 11. -2x-3=5. 8x-1= -25 7x - 12 = 21

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MAUDMARINE

Bonjour

3x+5 = 11

3x = 11 - 5

3x = 6

x = 6/3

x = 2

-2x-3=5

- 2x = 5 + 3

- 2x = 8

x = - 8/2

x = - 4

8x-1= -25

8x = - 25 + 1

8x = - 24

x = - 24/8

x = - 3

7x - 12 = 21

7x = 21 + 12

7x = 33

x = 33/7.

Réponse :

x = 2

x = -4

x = -3

x = 33/7

Explications étape par étape :

3x + 5 = 11

3x = 11 - 5

3x = 6

x = 6 ÷ 3

x = 2

-2x - 3 = 5

-2x = 5 + 3

-2x = 8

-x = 8 ÷ 2

-x = 4

x  = -4


8x - 1 = -25

8x = -25 + 1

8x = -24

x = -24 ÷ 8

x = -3

7x - 12 = 21

7 x = 21 + 12

7x = 33

x = 33 / 7

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