(0.5-x)(600+300*x/0.2)=300

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(0.5-x)(600+300*x/0.2)=300

(0.5-x)(600+300*x/0.2)=300
(0.5-x)(600+300*x/0.2)=300

(0.5-x)(600+300*x/0.2)=300
(x-0.5)(1500x+600)=-300
(x-0.5)(5x+2)=-1
5x²-0.5x-1=-1
x(5x-0.5)=0
x=0,x=0.1