Question 292185
You almost got it. 
Remember, absolute value problems are really two problems in one: a positive and a negative.
{{{abs(x-6)=15}}}
Positive solution:
{{{x-6=15}}}
{{{x=21}}}
.
.
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Negative solution:
{{{-(x-6)=15}}}
{{{x-6=-15}}}
{{{x=-9}}}