Equivalent Expressions

Definition

Two algebraic expressions are equivalent if they stay equal to each other, for any values their variables can take.

$x+3-9$

$-2\frac{x+1}{2}$

$b^2+x-b^2$

$xx-4$

$x-2x+1$

$2x^2-4x^2$

$x+x+x$

$2x-9+4x$

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