What would the ⍰ need to be in the expression below for the simplified form of the expression to be equal to

18xy6?
4x2y-52⍰x3y

The ⍰ would need to be a positive 8 in order for the simplified form of the expression to be equal to 18xy^6.

Thus, the expression would be:
4x^2y - 52(8)x^3y