Evaluate 12/21-4/7

$\frac{12}{21} - \frac{4}{7}$

Cancel the common factor of $12$ and $21$ .

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Factor $3$ out of $12$ .

$\frac{3 (4)}{21} - \frac{4}{7}$

Cancel the common factors.

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Factor $3$ out of $21$ .

$\frac{3 \cdot 4}{3 \cdot 7} - \frac{4}{7}$

Cancel the common factor.

$\frac{3 \cdot 4}{3 \cdot 7} - \frac{4}{7}$

Rewrite the expression.

$\frac{4}{7} - \frac{4}{7}$

Combine the numerators over the common denominator.

$\frac{4 - 4}{7}$

Subtract $4$ from $4$ .

$\frac{0}{7}$

Divide $0$ by $7$ .

$0$

Evaluate 12/21-4/7

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