Simplify -(3-3x)/21

$- \frac{3 - 3 x}{21}$

Factor $3$ out of $3$ .

$- \frac{3 (1) - 3 x}{21}$

Factor $3$ out of $- 3 x$ .

$- \frac{3 (1) + 3 (- x)}{21}$

Factor $3$ out of $3 (1) + 3 (- x)$ .

$- \frac{3 (1 - x)}{21}$

Cancel the common factors.

Factor $3$ out of $21$ .

$- \frac{3 (1 - x)}{3 \cdot 7}$

Cancel the common factor.

$- \frac{3 (1 - x)}{3 \cdot 7}$

Rewrite the expression.

$- \frac{1 - x}{7}$

$- \frac{1 - x}{7}$

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