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What should be added to $(\frac{2}{3}+\frac{3}{5})$ to get $\frac{−12}{15}$?
Given :
The given numbers are $(\frac{2}{3}+\frac{3}{5})$ and $\frac{-12}{15}$.
To do :
We have to find the number that should be added to $(\frac{2}{3}+\frac{3}{5})$ to get $\frac{-12}{15}$.
Solution :
Let the number to be added to $(\frac{2}{3}+\frac{3}{5})$ to get $\frac{-12}{15}$ be $x$.
This implies,
$(\frac{2}{3}+\frac{3}{5})+x=\frac{-12}{15}$
$x =\frac{-12}{15} - (\frac{2}{3}+\frac{3}{5})$
$x =\frac{-12}{15} - (\frac{2(5)+3(3)}{15})$
$x=\frac{-12}{15}-\frac{19}{15}$
$x = \frac{-12-19}{15}$
$x = \frac{-31}{15}$
The number to be added to $(\frac{2}{3}+\frac{3}{5})$ to get $\frac{-12}{15}$ is $\frac{-31}{15}$.     
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