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Fractions have a common denominator: 45

$ \frac{150}{45 }+\frac{ 180}{45 }= \frac{(150+180)}{45} $

$ \frac{(150+180)}{45 }=\frac{ 330}{45} $

$ \frac{330}{45 }=\frac{ 22}{3} $

$ $

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