49.5*53/5-(55-11/2)3/5

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49.5*53/5-(55-11/2)3/549.5*53/5-(55-11/2)3/549.5*53/5-(55-11/2)3/549.5*53/5-(55-11/2)3/5=49.5*53/5-4

49.5*53/5-(55-11/2)3/5
49.5*53/5-(55-11/2)3/5

49.5*53/5-(55-11/2)3/5
49.5*53/5-(55-11/2)3/5
=49.5*53/5-49.5*3/5
=49.5*(53/5-3/5)
=49.5*10
=495