To solve the equation \( 2x - 1 = 4x + 3 \), we can follow these steps:
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Start by isolating the variable \( x \):
\[ 2x - 1 = 4x + 3 \]
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Subtract \( 2x \) from both sides:
\[ -1 = 2x + 3 \]
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Next, subtract 3 from both sides:
\[ -1 - 3 = 2x \] \[ -4 = 2x \]
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Now, divide both sides by 2:
\[ x = -2 \]
The solution to the equation is \( \boxed{-2} \).