√x^2-x-6 -(x+3) =√x^2-9x+18.
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√x^2-x-6-x-3=√x^2-9x+18
x^2-2x-9=x^2-9x+18
-2x-9= -9x+18
7x=27
x=27/7
x^2-2x-9=x^2-9x+18
-2x-9= -9x+18
7x=27
x=27/7
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