a+[9b-2a-{6a+5b+(3a-—7-2b)}]-(-10a+2b+7)
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a+[9b-2a-{6a+5b+3a-7-2b}]-(-10a+2b+7)
a+[9b-2a-{9a-3b-7}]-(-10a+2b+7)
a+[9b-2a-9a+3b+7]-(-10a+2b+7)
a+[12b-11a+7]+10a-2b-7
a+12b-11a+7+10a-2b-7
10b
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