Please let me know if you need any clarification. I'm always happy to answer your questions.

x/x-3=3/x-3+3

multifly both sides by x-3

then we get

x=3+3(x-3)

then simplify

x=3+3x-9

x-3x=-6

-2x=-6

devide both side by -2

x=3

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Please let me know if you need any clarification. I'm always happy to answer your questions.