Jawabanmu

2014-08-29T18:55:23+07:00
( 7x-6 ) + ( 6x +4 )
8x -2
2014-08-29T18:55:35+07:00
(12x-6)+(9x-4)=
12x-6=-9x+4
12x+9x = 4+6
21x=10
x=10/21