Question 301107
-5n+3(6+7n)

First you have to open the brackets and expand the term

-5n + 3*6+3*7n

-5n+18+21n

Add the similar terms  -5n &  21n

since one term is negative and the other term is positive you have to subtract the co-efficients of the terms and put the sign of the bigger number in the result

-5n +21n +18

+16n+18