To solve the inequality \( 6x + 1 < 5x - 8 \), first, we need to isolate \( x \). Here are the steps:
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Subtract \( 5x \) from both sides:
\[ 6x - 5x + 1 < -8 \]
This simplifies to:
\[ x + 1 < -8 \]
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Next, subtract \( 1 \) from both sides:
\[ x < -8 - 1 \]
This simplifies to:
\[ x < -9 \]
So the solution to the inequality is:
\[ \boxed{x < -9} \]