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|2-x| -|x+3|+|x+4| = 2|x|
|2-x| = 2|x| +|x+3| - |x-4|
a) 2-x > 0, dan 2x, (x+3)>0, (x-4)>0
2-x = 2x +x + 3 -x + 4
2-x = 2x + 7
-3x = 5
x = - 5/3 (Tidak Memenuhi)
b) 2-x < 0, dan 2x, (x+3)> 0, (x-4)<0
2-x = 2x + x+3-(4-x)
2-x = 2x+x +3 - 4 + x
2-x = 4x - 1
-5x = -1-2
x= 3/5 (memenuhi)
c)(2-x) < 0 , 2x , (x+3)> 0 , (x-4)>0
x- 2 = 2x + x +3 - x + 4
x-2 = 2x + 7
-x = 9
x = -9 (memenuhi)