1$=100 cents
"\\implies" 20 cents = 0.2 $
"\\implies(\\frac{20}{x}-0.2)(x+5)=20"
"(20-0.2x)(x+5)=20x"
"20x+100-0.2x^2-x=20x"
"0.2x^2+x-100=0"
"x^2+5x-500=0"
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