To solve the equation \( 10x - 5x = -2 \), you can start by combining like terms on the left side.
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Combine \( 10x \) and \( -5x \): \[ 5x = -2 \]
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Next, to isolate \( x \), divide both sides by 5: \[ x = \frac{-2}{5} \]
Thus, the solution is: \[ x = -\frac{2}{5} \]