The goal is to use all given numbers (each of them once) and the following operations - $+$ , $-$ , $\times$ , $\div$ and parentheses - to formulate the equation that equals to the number $24$ .

Given four numbers $20$ , $30$ , $21$ and $4$ , is it possible to create an equation that equals $24$ ?

Yes, it is
No, impossible

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20•30÷(21+4)=24