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Meilleure réponse !
2013-01-28T19:56:55+01:00

A = -2(3-2x)=x-8

A = -6 +4x = x -8

A = 4x -x = 6 -8 

A = 3x = -2

A = x = -2/3

 

B= 8(1+7x) = -3(5-2x)

B= 8 +56x = -15 -6x

B = 56x +6x = -8 -15

B = 62x = -23

B = x = -23/62

 

C = 3-3( 2x -7) = 2x -5 (x-3)

3 -6x +21 = 2x -5x +15

24 -6x = -3x +15

-6x +3x = -24 +15

-3x = -9

x = -9/3 = - 3

 

D) 2x -3(2-2x) = 8 (-x +1) +2

2x -6 +6x = -8x +8 +2

+6x +8x = +6 +8+2

14x = 16

x = 16/14

x= 8/7