Simplify Variable Expressions

        Simplify the expression below.  Type your answer without spaces.

 $7k+6k$  

        Simplify the expression below.  Type your answer without spaces.

 $-4x+6x$  

        Simplify the expression below.  Type your answer without spaces.

 $4n+4+1+3n$  

        Simplify the expression below.  Type your answer without spaces.

 $1+5x+x-6$  

        Simplify the expression below.  Type your answer without spaces.

 $6-7n-2n-8$  

        Simplify the expression below.  Type your answer without spaces.

 $4\left(2n-1\right)$  

        Simplify the expression below.  Type your answer without spaces.

 $5\left(n-3\right)+7$  

        Simplify the expression below.  Type your answer without spaces.

 $4-2\left(n-6\right)$  

        Simplify the expression below.  Type your answer without spaces.

 $3n-\left(n-8\right)$  

       Bonus:  Simplify the expression below.  Type your answer without spaces.

 $\frac{1}{2}\left(4n-10\right)+2\left(n-3\right)$