Answer
$\dfrac{7}{3}x - 7$
Work Step by Step
RECALL
The distributive property states that for any real numbers a, b, and c:
$a(b-c) = ab -ac$
Use the distributive property by multiplying $\frac{1}{3}$ to each term of the binomial factor to obtain:
$=\frac{1}{3}(7x)-\frac{1}{3}(21)
\\=\frac{7}{3}x-\frac{21}{3}
\\=\frac{7}{3}x - 7$
