To solve the equation \( \frac{2}{3}x = -10 \) using the Division Property of Equality, we need to isolate \( x \).
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We start with the equation: \[ \frac{2}{3}x = -10 \]
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To isolate \( x \), we need to eliminate the fraction \( \frac{2}{3} \). We do this by dividing both sides of the equation by \( \frac{2}{3} \). This is equivalent to multiplying by the reciprocal, which is \( \frac{3}{2} \):
\[ x = -10 \cdot \frac{3}{2} \]
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Now, we perform the multiplication on the right side:
\[ x = -10 \cdot \frac{3}{2} = -15 \]
Therefore, the solution to the equation \( \frac{2}{3}x = -10 \) is:
\[ \boxed{-15} \]