1. 21=21
(Select) Reflexive symmetric closure associative

2. If 3=x then x=3
(Select) Associative Symmetric Identity Element Transirtive

3. 8+0=8 and 8*1=8
(Select) Transitive Closure Reflexive Identity Element

4. (3(a+5)=3a=3*5)
(Select) Distributive Symmetric Associative Closure

5. 5+(-5)=0
(Select) Identity Element Associative Inverse Closure

6. (2+3)+4=2+(3+4)
(Select) Inverse Associative Symmetric Distributive

7. a(b+c)=ab+ac
(Select) Distributive Reflexive Closure Associative

8. 4*2=2*4
(Select) Transivtive Closure Reflexive Cummutative

9. If x=4 and x+y=9, then 4+y=9
(Select) Symmetric Closure Substitution Associative

10. (5+2)+8=5+(2+8)
(Select) Associative Commutative Substitution Transitive

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