Question

log3 7+log3 6-log3 2

Answer 1

Do you mean,
\[\log_37+\log_36-\log_32\]?

Answer 2

Do you remember the properties,
\[\log a+\log b=\log(a\cdot b)\]\[\log a-\log b=\log(a/ b)\]\[\log_a (a^n)=n\]