(80-40-x)(200-10x)=9000

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(80-40-x)(200-10x)=9000(80-40-x)(200-10x)=9000(80-40-x)(200-10x)=9000 

(80-40-x)(200-10x)=9000
(80-40-x)(200-10x)=9000

(80-40-x)(200-10x)=9000