8 + (2 x 5) =  - 18, 12 - (5 x 2) =  - 2, (10 x 2) + 4 =  - 24, (4 x 3) + 2 =  - 14, (6 x 10) + (7 x 100) + 2 =  - 762, (7 x 100) + (2 x 100) + 30 = - 930, (5 x 20) + (7 x 1000) - 50 =  - 7.050, 12 + (4 x 2) - 5 = - 15, (314 x 2) + (5 x 2) - 10 = - 628, (3420 x 2) - (80 x 2) = - 6.680 , (10.000 x 4) + (100 x 3) + (2 x 7) = - 40.314,

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