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Mathematics for Grade 7 of Peking University Green Card (-3)-(+10)-
(-3)-(+ 10)-|-8|-(2) 4-[(-4)- 12] (4-5)-(7- 1 1)

=(-3)-(+ 10)-8-(2) =4-[-( 12+4)] =(- 1)-(-4) =-(3+ 10)-(8+2) =4-(- 16) =(- 1)+4 =(- 13)- 10 =4+ 16 =3

=-( 13+ 10) =20 =-23

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