After conversion, we have:
Realize that, the denominators are not the same? We need to make the denominators the same before we can add them. To do so, we can use the ideas behind Equivalent Fractions.
First, we multiply
7/
3 with the other fraction's denominator. Next we multiply
3/
4 with the other fraction's denominator. By doing so, both fractions will have like denominators. This is shown below: