They are called: Identical equations or Identities
See: http://www.tutorvista.com/search/value-algebraic-expressions
-33 - -7 = s
s = -26
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Yes, numerical expressions can have the same value. For example, the expressions 2+3 and 5 both have the value of 5. Similarly, the expressions 2x3 and 6 both have the value of 6. In general, any two numerical expressions that evaluate to the same number will have the same value.
equivalent
They are equivalent fractions.
It is an equation
Because when a has any other value they do not have the same value.