Réponses

2013-05-11T22:35:55+02:00

9x-7x+5-9x=6-4x+8x

9x-7x-9x-8x+4x=-5+6

-11x=1

x=-1/11

 

-(18-x)+7(3x+5)=-(2-4x)

-18+x+21x+35=-2+4x

18x=1

x=1/18