2(5x:25)=y

To simplify the equation \( 2(5x:25) = y \), we first need to interpret the expression correctly. The colon (:) can be seen as a division sign. Therefore, we can rewrite the expression inside the parentheses:

\[ 5x:25 = \frac{5x}{25} \]

Next, we simplify \(\frac{5x}{25}\):

\[ \frac{5x}{25} = \frac{x}{5} \]

Now, substituting back into the original equation gives:

\[ 2\left(\frac{x}{5}\right) = y \]

Multiplying gives:

\[ \frac{2x}{5} = y \]

Thus, the simplified form of the equation is:

\[ y = \frac{2x}{5} \]