Let's solve the equation \( 4x = 3(x + 5) - 15 \).
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Distribute the \( 3 \) on the right side: \[ 4x = 3x + 15 - 15 \]
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Simplify the right side: \[ 4x = 3x + 0 \] \[ 4x = 3x \]
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Subtract \( 3x \) from both sides: \[ 4x - 3x = 0 \] \[ x = 0 \]
The equation has one solution: \( x = 0 \).
Therefore, the correct response is: The equation has one solution: x equals 0.