7(3+n)+3(2+4n)=-11

Solution for 7(3+n)+3(2+4n)=-11 equation:

7(3+n)+3(2+4n)=-11

We simplify the equation to the form, which is simple to understand 
7(3+n)+3(2+4n)=-11

Reorder the terms in parentheses
+(+21+7n)+3*(2+4n)=-11

Remove unnecessary parentheses
+21+7n+3+*(+2+4n+)=-11

Reorder the terms in parentheses
+21+7n+(+6+12n)=-11

Remove unnecessary parentheses
+21+7n+6+12n=-11

We move all terms containing n to the left and all other terms to the right. 
+7n+12n=-11-21-6

We simplify left and right side of the equation. 
+19n=-38

We divide both sides of the equation by 19 to get n. 
n=-2