Factor (9a)-(7-7(7a-3))

$(9 a) - (7 - 7 (7 a - 3))$

Simplify each term.

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Apply the distributive property.

$9 a - (7 - 7 (7 a) - 7 \cdot - 3)$

Multiply $7$ by $- 7$ .

$9 a - (7 - 49 a - 7 \cdot - 3)$

Multiply $- 7$ by $- 3$ .

$9 a - (7 - 49 a + 21)$

Add $7$ and $21$ .

$9 a - (- 49 a + 28)$

Apply the distributive property.

$9 a - (- 49 a) - 1 \cdot 28$

Multiply $- 49$ by $- 1$ .

$9 a + 49 a - 1 \cdot 28$

Multiply $- 1$ by $28$ .

$9 a + 49 a - 28$

Add $9 a$ and $49 a$ .

$58 a - 28$

Factor $2$ out of $58 a - 28$ .

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Factor $2$ out of $58 a$ .

$2 (29 a) - 28$

Factor $2$ out of $- 28$ .

$2 (29 a) + 2 (- 14)$

Factor $2$ out of $2 (29 a) + 2 (- 14)$ .

$2 (29 a - 14)$

Factor (9a)-(7-7(7a-3))

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