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45 + (-34) =
45 - 34 = 11
B) (120)+(-30)+(32)+(-42) =
120 - 30 + 32 - 42 =
90 - 10 = 80
C) [(60)+(-20)]+[(50)+(36)+(15)] =
( 60 - 20 ) + (86 + 15) =
40 + 101 = 141