There were 50 x 3 = <<50*3=150>>150 tadpoles.
There are 50 - 7 = <<50-7=43>>43 fish left in the pond.
There are 150/2 = <<150/2=75>>75 tadpoles left in the pond.
There are 75 - 43 = <<75-43=32>>32 more tadpoles than fish in the pond now.
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