What Does the Word Issue Mean in Mathematics?

What does the word issue mean in mathematics?
For an answer, we are able to appear to an example: envision a formula which you will be comfortable with to solve an issue: multiply the sum of two or much more numbers.
In this case, you would not need to know the topic matter, just sufficient to discover the formula. How would you fare when you have been asked to resolve the same equation without having to know its formula?
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This has been performed numerous times in mathematics, like solving partial differential equations, as an illustration