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{7}
= 68-39 ÷ 21
= 24÷21
= 8/7
= 1.142857143
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