Odpowiedzi

2009-10-21T21:10:29+02:00
2x+6+9x-6=x-20
11x=x-20
10x=(-20)
1x=(-2)
2009-10-21T21:14:08+02:00
(2x+6) + (9x-6)=x-20
(18x+12x) + (54x-36) =x-20
30x + 54 x +36=x-20
84x +36 =x-20
36+20=X-84x
56= -83x / -83
-27=x

2009-10-21T22:34:34+02:00
2x +6 +9x-6=x-20

6-6+20=x-9x-2x
20=-10x
x=-2