63-(-3)[{-2-8-3}÷3{5+(-2)(-1)}]
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63 - ( - 3 ) [ { - 2 - 8 - 3 } ÷ 3 { 5 + ( - 2 ) ( - 1 ) } ]
= 63 - ( - 3 ) [ -13 ÷ 3 { 5 + ( - 2 ) ( - 1 ) } ]
= 63 - ( - 3 ) [ -13 ÷ 3 { 5 + 2 } ]
= 63 - ( - 3 ) [ -13 ÷ 3 { 7} ]
= 63 - ( - 3 ) [ -13/ 3 { 7} ]
= 63 - ( - 3 ) [ -91/3 ]
= 63 - 91
= -28
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