Jawabanmu

2014-03-14T21:06:41+07:00
2x+7=5x-11
2x-5x=-11-7
-3x=-18
x=6
X+3 = 6+3 = 9

2014-03-14T21:08:22+07:00
2x + 7        = = 5x - 11
2x - 2x + 7 = 5x - 2x -11
7               = 3x - 11
7 + 11       = 3x - 11 + 11
18             = 3x
18 : 3        = x
6               = x

Jadi nilai x + 3 adalah 6 + 3 = 9  
2 5 2