4х/3в-21 + 3в/14-2в

To simplify the expression, we need to combine like terms.

First, let's look at the denominators. We have (3в) and (14-2в). We can't combine these denominators since they are different.

Let's rewrite the expression using the least common denominator (LCD) of (3в) and (14-2в), which is 3в(14-2в).

The expression becomes:

(4х/3в) * ((14-2в)/(14-2в)) - (3в/(14-2в)) * (3в/(3в))

Now, let's simplify each term:

(4х * (14-2в)) / (3в(14-2в)) - (3в * 3в) / (3в(14-2в))

Expanding and canceling out like terms, we get:

(56х - 8хв) / (42в - 6в²) - 9в² / (42в - 6в²)

Now, combining the numerators:

(56х - 8хв - 9в²) / (42в - 6в²)

So, the simplified expression is:

(56х - 8хв - 9в²) / (42в - 6в²)