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Sagot :

TALAMASADONAI

Réponse :

Bonjour,

12.

a) 2x + 18 = 4x

2x-4x = -18

-2x = -18

(on multiplie par -1 des deux côtés:)

2x=18

x=18/2 = 9

b) 5x - 10 =4x+ 9

5x - 4x = 9 + 10

x= 19

c) 3x- 12 = -5x - 4

3x + 5x = -4 + 12

8x = 8

x= 8/8= 1

d) x+5 = 4x+4 + 7

x-4x = 4+7-5

-3x = 11-5

-3x =6

x= 6/-3 = -2

e) 3x-7 = -2x + 8

3x+2x = 8+7

5x = 15

x = 15/5 = 3

f) 4x+20 = 10x-30

4x-10x = -30-20

-6x = -50

x= 50/6

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