exec() give an TypeError: unsupported operand type(s) for -: 'list' and 'int'

Question

My program create a formula to calculate later, so I have an string, line = " ((3 + 1) * (3 + 2) * (3 + 3) * (3 + 4) * (3 + 5) * [- pow((3 - 1), (6