( 2 / 5 t - 1 ) * ( 3 / 5 + 1 ) = ( 2 / 5 t - 1 ) * 8 / 5 = ( 2 * 8 ) / ( 5 t * 5 ) - 1 * 8 / 5 = 16 / 25 t - 8 / 5
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