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Sagot :

Bonjour,

a) 5x = 3x + 3

2x = 3

x = 3/2 = 1,5

b) 8x = 12x + 4

- 4 = 12x - 8x

4x = - 4

x = -4/4 = -1

c) 4 - 7y = 10y

4 = 17y

y = 4/17

d) 7x + 1 = -4 - x

8x = -5

x = -5/8

e) 2 + 3x = 7 - 3x

3x + 3x = 7 - 2

6x = 5

x = 5/6

f) 5 + 6x = -x - 9

6x + x = - 9 - 5

7x = - 14

x = -14/7 = -2

g) 11x + 3 = 8x + 7

11x - 8x = 7 - 3

3x = 4

x = 3/4 = 0,75

h) 5,5x + 1,5 = 9x + 6

1,5 - 6 = 9x - 5,5x

-4,5 = 3,5x

x = -4,5/3,5 = - 45/35 = -9/7

i) 5,1 - x = - 8x + 1,7

- x + 8x = 1,7 - 5,1

7x = -3,4

x = - 3,4/7 = - 34/70 = - 17/35

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