Simplifying Algebraic Expressions

1. Combine the like terms to create an equivalent expression: $−n+(−4)−(−4n)+6$

2. Combine the like terms to create an equivalent expression: $-2 x-x+8$

3. Combine the like terms to create an equivalent expression: $2 s+(-4 s)$

4. Combine the like terms to create an equivalent expression: $-3 x-6+(-1)$

5. Combine the like terms to create an equivalent expression: $2 r+1+(-4 r)+7$

6 . Combine the like terms to create an equivalent expression: $−5r+8r+5$

7. Combine the like terms to create an equivalent expression: $r+(−5r)$