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I’m not sure what the question is but the attachment below is a possibility of the answer of what you’re looking for
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Answer:

x-3

Step-by-step explanation:

(-x-6)+(2x+3)=-x-6+2x+3 Remove brackets

=(-x+2x)+(3-6) Group like terms

=(-1+2)x +(3-6) Distributive property

=x-3 Solution