Subtract the difference of8. 4 and 15. 25 from 20. 55
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8.4-15.25=-6.85
now subtract-6.85 from 20.55
20.55-(-6.85)
20.55+6.85=27.4
now subtract-6.85 from 20.55
20.55-(-6.85)
20.55+6.85=27.4
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