Fix the error $in$ Step $3$ and provide the correct answer $to$ the problem.

Write the following logarithmic expression $as$ a single logarithm.

$7ln(x)-2ln(7)-\frac{1}{3}ln(y)$

STEP $1$: $=ln(x^7)-ln(7^2)-ln(y^{\frac{1}{3}})$

STEP $2$: $=ln(x^7)-ln(49)-ln(\sqrt[3]{y})$

STEP $3$: $=ln(,)-ln(\sqrt[3]{y})$

STEP $4$: $=ln(,)$