Simplify 2(-1/2)

$2 (- \frac{1}{2})$

Move the leading negative in $- \frac{1}{2}$ into the numerator.

$2 (\frac{- 1}{2})$

Cancel the common factor.

$2 (\frac{- 1}{2})$

Rewrite the expression.

$- 1$

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