lg(x2-2x)=lg(2x+12)
2x-2x=2x+12
2x-2x-2x=12
-2x=12
x=12:(-2)
x=-6
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lg(x2-2x)=lg(2x+12)
2x-2x=2x+12
2x-2x-2x=12
-2x=12
x=12:(-2)
x=-6