Evaluate
-\frac{13\pi }{3}\approx -13.613568166
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-\frac{7\pi }{3}+\frac{3\left(-2\right)\pi }{3}
To add or subtract expressions, expand them to make their denominators the same. Multiply -2\pi times \frac{3}{3}.
\frac{-7\pi +3\left(-2\right)\pi }{3}
Since -\frac{7\pi }{3} and \frac{3\left(-2\right)\pi }{3} have the same denominator, add them by adding their numerators.
\frac{-7\pi -6\pi }{3}
Do the multiplications in -7\pi +3\left(-2\right)\pi .
\frac{-13\pi }{3}
Combine like terms in -7\pi -6\pi .
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