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\frac{1}{2}x+\frac{1}{2}\left(-5\right)-\frac{1}{2}\left(x+3\right)
Use the distributive property to multiply \frac{1}{2} by x-5.
\frac{1}{2}x+\frac{-5}{2}-\frac{1}{2}\left(x+3\right)
Multiply \frac{1}{2} and -5 to get \frac{-5}{2}.
\frac{1}{2}x-\frac{5}{2}-\frac{1}{2}\left(x+3\right)
Fraction \frac{-5}{2} can be rewritten as -\frac{5}{2} by extracting the negative sign.
\frac{1}{2}x-\frac{5}{2}-\frac{1}{2}x-\frac{1}{2}\times 3
Use the distributive property to multiply -\frac{1}{2} by x+3.
\frac{1}{2}x-\frac{5}{2}-\frac{1}{2}x+\frac{-3}{2}
Express -\frac{1}{2}\times 3 as a single fraction.
\frac{1}{2}x-\frac{5}{2}-\frac{1}{2}x-\frac{3}{2}
Fraction \frac{-3}{2} can be rewritten as -\frac{3}{2} by extracting the negative sign.
-\frac{5}{2}-\frac{3}{2}
Combine \frac{1}{2}x and -\frac{1}{2}x to get 0.
\frac{-5-3}{2}
Since -\frac{5}{2} and \frac{3}{2} have the same denominator, subtract them by subtracting their numerators.
\frac{-8}{2}
Subtract 3 from -5 to get -8.
-4
Divide -8 by 2 to get -4.
\frac{x-5-\left(x+3\right)}{2}
Factor out \frac{1}{2}.
-4
Simplify.