Question 238257
Hello!
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Since both fractions have the same denominator (# at the bottom), you may just deduct 5 from 21 and write the same denominator for that answer.
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Problem:
{{{(21/17x)-(5/17x)}}}
This is the same as to say...
{{{(21-5)/(17x)}}} so...
{{{16/17x}}} is your solution.  :)