To solve the equation \( 3y = 40 - 5y \), we can start by getting all the terms involving \( y \) on one side of the equation.
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First, add \( 5y \) to both sides of the equation:
\[ 3y + 5y = 40 \]
This simplifies to:
\[ 8y = 40 \]
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Next, divide both sides by 8 to solve for \( y \):
\[ y = \frac{40}{8} \]
Therefore:
\[ y = 5 \]
The solution to the equation is \( y = 5 \).