Question

5*(810:9-х*3)=315

 

 

 

 

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Answer 1

5*(810/9-х*3)=40*8-5
5*(90-х*3)=320-5
5*(90-х*3)=315
90-х*3=315/5
90-х*3=63
х*3=90-63
х*3=27
х=27/3
х=9