Algebra Rule 8
Fractions with common denominators can be combined
```{(a+b) \over c} = {a \over c} + {b \over c}```
Description:
Two fractions with common denominators can be added by adding the numerators and leaving the denominator unchanged. Going the other direction, we can also break apart a fraction with an addition in the numerator into two fractions (each with the common denominator).
```{(1+2) \over 4} = {3 \over 4} = {1 \over 4} + {2 \over 4}```
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