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(-27-24+50)-(3+56-50)
-2-(9)
-2-9
-11
= ( 9(-3) - 3(8) + 5(10) ) - ( -(-3) + 7(8) - 5(10) )
= ( -27 - 24+ 50 ) - ( 3 + 56 - 50 )
= -1 - 9 = -10
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