Question

-2*a*b*c+3*b*c*a-2*a**b+b*a

Answer 1

-2*a*b*c+3*b*c*a-2*a**b+b*a= -2abc+3abc-2ab+ab= abc-ab

Answer 2

The expression you provided, -2abc+3bca-2a**b+ba, is not well-formed. It contains both multiplication and exponentiation operations, but it's not clear how the operands should be grouped.

If you could clarify the intended grouping and the order of operations, I can provide the solution accordingly.