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First thing to do is clear the denominators. We will need to come back to this step later to verify our 'answer' is a valid one. So cross multiply and clear them.

Now expand

simplify

collect like terms
Will that value if k make either of the original denominators = 0? No it won't so, 1/10 is a valid possibility.
Check the original equation using x=(1/10) and verify it satisfies the equation. Does it?

which is true. so the answer is 1/10