(5 + 30 * ( 1 - ( 1 - ( 0.01 / 0.3 ) )^( ( (450 + x) / 50 ) / 0.55 ) )) - (5 + 30 * ( 1 - ( 1 - ( 0.01 / 0.3 ) )^( ( 450 / 50 ) / 0.55 ) )) = (1.2912 / 0.71)

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