a is a real number. Solve |x-4|=a.
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for x<4
|x-4| = -x+4 = a
x = 4-a
for x>4
|x-4| = x-4 = a
x = 4+a.
|x-4| = -x+4 = a
x = 4-a
for x>4
|x-4| = x-4 = a
x = 4+a.
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