an unsolvable algebraic expression. It isn't equal to anything so it isn't an equation. It contains 2 variables x and n so without more info that is it.
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It is: (-5-2) times -3 = +21
a negative times a positive is a negative so 2*-4=-8+10=2
-4 + -5 + -2 + -1 = -12 (negative 12).
7
negative three