Simplify -7a^2+3a-9de*5a^2-6a-4

$- 7 a^{2} + 3 a - 9 d e \cdot 5 a^{2} - 6 a - 4$

Multiply $5$ by $- 9$ .

$- 7 a^{2} + 3 a - 45 d e a^{2} - 6 a - 4$