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You can not add (or subtract) numbers, or in this case fractions, with variables unless both numbers contain the same variable.

Here is an example:

You can not add

1/2 + x

because the fraction does not contain the variable 'x'

This equation however is possible to solve:

1/2x + x

because both numbers contain the variable 'x'

But don't get tricked

It is impossible to add or subtract numbers with different variables, as each variable has a different value

Example:

1/2x + 1/2y

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Q: How do you add a fraction with variables?
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