Jawabanmu

2014-03-25T22:29:53+07:00
(2x-3)-(5x+4)=12-5x
(x-5)+(3-2x)=6x-3

2014-03-25T22:38:53+07:00
2x-3-5x-4=12-5x
-3x-7      = 12-5x
-3x+5x   =  12+7
2x  = 19
 x = 19/2 = 9 1/2 = 8,5

b. (x - 5) + (3 -2x) = 6x - 3
      x - 5 +3 - 2x  = 6x - 3
      -x - 2        = 6x - 3
      -x - 6x = -3 + 2
       -7x = -1
          x = 1/7 = 0,14285714286


semoga bermanfaat y :))