An equivalent expression.
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Equivalent Expression
No, expressions cannot have the same value in algebra. They may be assigned to different values and on solving we can get different answers in each case.
algebraic expressions
An equation, or, perhaps an equality. 5X - 5 = 20 this equation has the same value that will satisfy it, with some manipulation this is two expressions having the same value 10 - 6 = 2 + 2
If x stays the same the expression stays the same. Since the expression involves negative x, the value of the expression decreases as x increases.