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X=9
=>X-4=-5
X=-1
x-4 = 5
x-4+4 = 5+4
x = 9
atau
x-4 = -5
x-4+4 = -5+4
x = -1
|x-4| = 5
|9-4| = |5|
|9-4| = 5
atau
|x-4| = -5
|-1-4| = |-5|
|-5| = 5