63÷9×4+∆ {44+13×(-4)-5-11+}=10
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63÷9×4+∆ {44+13×(-4)-5-11+}=10
7*4+∆ (44-52-16)=10
-24∆ =10-28
-24∆ =-18
∆ =18/24=3/4
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