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|x-2x| <= 4
|x-2x|
• x-2x
• -(x-2x)
x-2x <= 4
-x <= 4
x >= -4
-(x-2x) <= 4
-x+2x <= 4
x <= 4
Nilai X yang memenuhi adalah X >= -4 atau X <= 4
Semoga Membantu ^_^