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\frac{x}{y-1}-\frac{x}{2\left(-y+1\right)}
Factor 2-2y.
\frac{2x}{2\left(y-1\right)}-\frac{-x}{2\left(y-1\right)}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of y-1 and 2\left(-y+1\right) is 2\left(y-1\right). Multiply \frac{x}{y-1} times \frac{2}{2}. Multiply \frac{x}{2\left(-y+1\right)} times \frac{-1}{-1}.
\frac{2x-\left(-x\right)}{2\left(y-1\right)}
Since \frac{2x}{2\left(y-1\right)} and \frac{-x}{2\left(y-1\right)} have the same denominator, subtract them by subtracting their numerators.
\frac{2x+x}{2\left(y-1\right)}
Do the multiplications in 2x-\left(-x\right).
\frac{3x}{2\left(y-1\right)}
Combine like terms in 2x+x.
\frac{3x}{2y-2}
Expand 2\left(y-1\right).