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# Solving Problems

Whilst Soulver happily accepts words and sentences alongside numbers, there are some expressions which cannot be evaluated.

Here are some examples of problematic expressions:

- Anything divided by zero is impossible to calculate.

Example:
1/0

- Decimals with more than one dot will not evaluate.

Example:
1.1.3 + 1.2.1

- Absurdly large numbers may not be evaluated.

Example:
123^123123123

- You can not add units of different types together.

Example:
10 meters + 3 hours

- Soulver will not allow you to redefine a variable in terms of itself.

Example:
a = 2
a = a + 21

- You cannot use the alphabetical letter "x" as a times operator. Use * instead (and by default it will be replaced with the subtlety different (×) character

Example:
5 x 4

If your expression still does not evaluate, there may be a bug. Please email us with a description of your problem.