Answer
$$\left\langle \frac{5}{2}, 5\right\rangle.$$
Work Step by Step
$$
\left\langle-\frac{1}{2}, \frac{5}{3}\right\rangle+\left\langle 3, \frac{10}{3}\right\rangle=\left\langle \frac{5}{2}, 5\right\rangle
$$
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