Work from the inside out. Simplify -5(-x). Combine with the 3. Simplify -[3 + 5x]. Combine with the 4x. On the other side, simplify -(4x - 9). Combine with the 10. Then solve as usual.
Do you know that various grouping symbols are all equivalent? (), [], {} and some lines. It's just another way to group things. If you are used to parentheses, (), just treat them all like parentheses.
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