Odpowiedzi

2010-04-12T16:40:43+02:00
2 ( x + x + 6 ) = 2 [ 0,8 ( x + 6 ) + 1,25 x ]
2x+2x+12=2[0,8x+4,8+1,25x]
2x+2x+12=1,6x+9,6+2,5x
2x+2x-1,6x-2,5x=9,6-12
-0,1x=-2,4
x=24