(20-x)(32-2x)=5000

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(20-x)(32-2x)=5000

(20-x)(32-2x)=5000
(20-x)(32-2x)=5000

(20-x)(32-2x)=5000
(20-x)(32-2x)=5000
640-72x+2x²=5000
x²-36x-2180=0
x=18±2√626