Réponses

2014-05-07T17:50:03+02:00
2(2x+6)=x-(20-x)
2*2x +2*6 = x -20 +x
12x +12 = 2x-20
12x -2x =  -20 -12
10x =  -32
x  = -32/10
x  =  -16/5