Question 753148
{{{-5n+3(6+7n)}}}
<br />
Open brackets (multiply the terms in the bracket by "+3")
{{{-5n+18+21n}}}
Collect like terms
{{{-5n+21n+18}}}
={{{16n+18}}}

And that's your answer.
PS: you can as well factorise the expression {{{16n+18}}} to get
{{{2(8n+9)}}}

Hope I helped?!