Question

How do you subtract this

Answer 1

To subtract fractions, you need to obtain a common denominator. We can achieve this, in this case, by multiplying:

$(\frac{4}{4} * \frac{22}{13}) - (\frac{13}{13}*\frac{21}{4})$

Simplify this:

$\frac{88}{52} - \frac{286}{52}$

Now we have common denominators, so we can easily just subtract the numerators, and we have the answer:

$-\frac{198}{52}$

Notice that this is divisible by 2:

$-\frac{99}{26}$

That's your answer!