From the sum of -93 and -106,subtract the difference of 43 and -86

[(-93)+ (-106) ] - [43 - (-86) ]

= [-199] - [129]

= -328

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{[-90]+[-106] } - {43 - [-86]}

[-196] - [-129]

196-129

-67 ans

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it is not (-90) it is (-93)

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ok then ans = -70

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