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( 600 * ( 1000000 + 500000 * x ) ) - ( 1000000 * ( 600 * ( 1 + 0.5 * x ) ) )
( 600 * ( 1000000 + 500000 * x ) ) - ( 1000000 * ( 600 * ( 1 + 0.5 * x ) ) )
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