21 ÷ [(-6) - (-3)] + 28 ÷ [ -3 - (-4) ]
21 ÷ [ -6 + 3 ] + 28 ÷ [ -3 + 4 ]
21 ÷ -3 + 28 ÷ 1
-7 + 28
21
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21 ÷ [(-6) - (-3)] + 28 ÷ [ -3 - (-4) ]
21 ÷ [ -6 + 3 ] + 28 ÷ [ -3 + 4 ]
21 ÷ -3 + 28 ÷ 1
-7 + 28
21