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Reflexive
a = a
example: b + 12 = b + 12
Symmetric
a = b , b = a
example: 18 = -2n + 4 | -2n + 4 = 18
Transitive
a = b , b = c , a = c
example: 5p + 3 = 48 | 48 = 7p - 15 | 5p + 3 = 7p - 15
Substitution
a = b they can replace each other
example: (6 + 1)x = 21 | 7x = 21