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-78 * 2= -156
-23-45=-78
43+21=74
-12 : 2= -6
-26 : (-2) = 13
-5 * (-4) = 20
145- (-12) =157
23*8 - 3 + 6 * (-7)= 184-3+(-42)=181-42=139
(-24+13 +1 ) :(-2)= (-11+1) : (-2)=-10: (-2)= 5