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