To solve the equation \( 10 = -9 - x \), you can follow these steps:
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Add \( 9 \) to both sides of the equation to isolate \( -x \): \[ 10 + 9 = -x \] \[ 19 = -x \]
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Multiply both sides by -1 to solve for \( x \): \[ x = -19 \]
So, the solution is \( x = -19 \).