Question

378-(181-x)=215

Answer 1

378 - ( 181 - x ) = 215

           181 - x   =  378 - 215

            181 - x  =      163

                    x   =  181 - 163

                    x    =     18

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Answer 2

378-(181-x)=215 

=> 181-x=378-215

=> 181-x=163

=>       x=181-163

=>       x=18

   Vậy x=18