X2
Is an algebraic expression.
X2 = 4
Is an equation that can be solved for X. The variable, X, in this case, has two values. In the expression any value can be substituted for X.
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difference
An equation is a ploblem with no answer and an expression is a problem with an answer so you'll get different answers with an equation and an expression.
y = h + 8
x + 12 = -12
32-2x < 18