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\frac{2x}{5x}-\frac{4\times 5}{5x}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of 5 and x is 5x. Multiply \frac{2}{5} times \frac{x}{x}. Multiply \frac{4}{x} times \frac{5}{5}.
\frac{2x-4\times 5}{5x}
Since \frac{2x}{5x} and \frac{4\times 5}{5x} have the same denominator, subtract them by subtracting their numerators.
\frac{2x-20}{5x}
Do the multiplications in 2x-4\times 5.