evaluate 28 - (-43) +(-16) - (-128)-68
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= 28 - ( -43)+ (-16) - (-128) - 68
= 28 + 43 -16 + 128 -68
= 128 + 28+ 43 - 16 - 68
= 156 + 43 - 84
= 156 - 41
= 115
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