[tex]2 + ( - 4 + 5) - ( + 6 + 6) + 7 = \\ 2 + 1 - 12 + 7 \\ = \bf - 2[/tex]
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[tex]2 + ( - 4 + 5) - ( + 6 + 6) + 7 = \\ 2 + 1 - 12 + 7 \\ = \bf - 2[/tex]