Add (-7x^3+5ax-3)+(7x^3+5-9ax)

$(- 7 x^{3} + 5 a x - 3) + (7 x^{3} + 5 - 9 a x)$

Remove parentheses.

$- 7 x^{3} + 5 a x - 3 + 7 x^{3} + 5 - 9 a x$

Combine the opposite terms in $- 7 x^{3} + 5 a x - 3 + 7 x^{3} + 5 - 9 a x$ .

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Add $- 7 x^{3}$ and $7 x^{3}$ .

$5 a x - 3 + 0 + 5 - 9 a x$

Add $5 a x - 3$ and $0$ .

$5 a x - 3 + 5 - 9 a x$

Subtract $9 a x$ from $5 a x$ .

$- 4 a x - 3 + 5$

Add $- 3$ and $5$ .

$- 4 a x + 2$

Add (-7x^3+5ax-3)+(7x^3+5-9ax)

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