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Math problem: Some questions about removing brackets or merging introversion.
(x？ +5x？ +4x-3)-(-x？ +2x？ -3x- 1)+(4-7x-6x？ +x？ )

=x？ +5x？ +4x-3+x？ -2x？ +3x+ 1+4-7x-6x？ +x？ (descending order)

=x？ +x？ -2x？ +5x？ +x？ -6x？ +4x+3x-7x-3+ 1+4

=2

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