Question: write a small parser input with string expression, double result, the calculation result of expression is the same as result, and the operation contained in

write a small parser input with string expression, double result, the calculation result of expression is the same as result, and the operation contained in expression is only / and *, and there is an unknown number n , and finally returns the value of n. example : expression = "201.55 * n * 3", result = 999

Write program in Java

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