To solve the equation \( y - 25 = 6y \), follow these steps:
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Rearrange the equation to bring all terms involving \( y \) to one side:
\[ y - 6y = 25 \]
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Combine the terms on the left side:
\[ -5y = 25 \]
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Divide both sides by \(-5\) to solve for \( y \):
\[ y = \frac{25}{-5} = -5 \]
So the solution is
\[ \boxed{-5} \]