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\frac{b}{ab}-\frac{2a}{ab}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of a and b is ab. Multiply \frac{1}{a} times \frac{b}{b}. Multiply \frac{2}{b} times \frac{a}{a}.
\frac{b-2a}{ab}
Since \frac{b}{ab} and \frac{2a}{ab} have the same denominator, subtract them by subtracting their numerators.