Simplify: 1/(7x)-1/(5x) and Find a solution: 1/9x+1/10=11/90 please and thank you.

Simplify: 1/(7x)-1/(5x) and Find a solution: 1/9x+1/10=11/90 please and thank you.

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\[\frac{1}{7x}-\frac{1}{5x}\]Find a common denominator, then combine. Do you know how to do that?

I think so. Thank you.

For the other one, the same approach is appropriate. Find a common denominator, or multiply the whole equation by the product of all of the denominators.

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