To solve the equation \( 5y - 10 = -25 \), follow these steps:
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Add 10 to both sides of the equation: \[ 5y - 10 + 10 = -25 + 10 \] This simplifies to: \[ 5y = -15 \]
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Divide both sides by 5: \[ y = \frac{-15}{5} \] This simplifies to: \[ y = -3 \]
Thus, the solution is: \[ \boxed{-3} \]