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Sagot :

Bonsoir,

exercice 5

a)

3x = 8-2

3x= 6

x= 6/3

x= 2

b)

6x = -11-1

6x= -12

x= -12/6 = -2

c)

25x = 30 -105

15x = -75

x= -75/15 = -5

d)

7+49 = 8x

56 =8x

8x= 56

x = 56/8 =7

exercice 7

a)

2x+3x = 15 -5

5x = 10

x= 10/5

x= 2

b)

4+1  = -x +6x

5 = 5x

5x=5

x= 5/5

x= 1

c)

7m-m =-8 -10

6m = -18

m = -18/6

m = -3

d)

-12y +13y = 4

y = 4

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