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Sagot :

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bonsoir

x + 7 = 0

x = - 7

x - 1 = 0

x = 1

2 x + 4 = 0

2 x = - 4

x = - 2

3 x - 9 = 0

3 x = 9

x = 3

3 x - 9 = 2

3 x = 2 - 9

3 x = - 7

x = - 7/3

- x + 4 = 6

- x = 6 - 4

- x = 2

x = - 2

- 4 - 3 x = 6

- 3 x = 6 + 4

- 3 x = 10

x = - 10/ 3

allez continue, tu as vu comment on fait

STELLAPHILIPPE2

Explications étape par étape :

a.       x + 7 = 0

    ⇔ x = -7

b.       x - 1 = 0

    ⇔  x = 1

c.      2x + 4 = 0

    ⇔ 2x = -4

    ⇔ x = -4/2

    ⇔ x = -2

d.       3x- 9 = 0

    ⇔ 3x = 9

    ⇔ x = 9/3

    ⇔ x = 3

e.       3x - 9 = 2

    ⇔ 3x = 2 + 9

    ⇔ 3x = 11

    ⇔ x = 11/3

f.      -x + 4 = 6

    ⇔ -x = 6 - 4

    ⇔ -x = 2

    ⇔ x = -2

g.    -4 - 3x = 6

   ⇔ -3x = 6 + 4

   ⇔ -3x = 10

   ⇔ x = -10/3

h.      -5x - 15 = 0

    ⇔ -5x = 15

    ⇔ x = 15/-5

    ⇔ x = -3

i.        -5x - 3 + 7x = 0

    ⇔ 2x = 3

    ⇔ x = 3/2

j.     2 + 6x - 4 = 3

  ⇔ 6x = 3 - 2 + 4

  ⇔ 6x = 5

  ⇔ x = 5/6

k.     -4 - 3x = 6 + 5x

   ⇔ -3x - 5x = 6 + 4

   ⇔ -8x = 10

   ⇔ x = 10/-8

   ⇔ x = -5/4

l.      -6x + 2 =  9 - 3x

   ⇔ -6x + 3x = 9 - 2

   ⇔ -3x = 7

   ⇔ x = -7/3

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