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Theory

$\frac{a}{a} = 1$

Any non-zero number or expression divided by itself is equal to

1 .

\frac{4 5}{4 5} = 1 \frac{2 x + 5}{2 x + 5} = 1

This is true for all values of the variables except the one(s) that makes the denominator

0 .

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