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We can see that there are 4 intermediate subtraction sums, so the result of the division is a 4-digit number, and the multiples of the divisor all have either 2 or 3 digits, so the divisor is a 2-digit number.

So we can use the

SubstitutedDivision()solver from theenigma.pylibrary to solve this puzzle. It takes 113ms.Solution:The correct division sum is given below:Or, we can use the

SubstitutedExpression()solver from theenigma.pylibrary to get a solution in 93ms.