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Evaluate
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Differentiate w.r.t. x
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\frac{7\times 7x}{35}-\frac{5x}{35}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of 5 and 7 is 35. Multiply \frac{7x}{5} times \frac{7}{7}. Multiply \frac{x}{7} times \frac{5}{5}.
\frac{7\times 7x-5x}{35}
Since \frac{7\times 7x}{35} and \frac{5x}{35} have the same denominator, subtract them by subtracting their numerators.
\frac{49x-5x}{35}
Do the multiplications in 7\times 7x-5x.
\frac{44x}{35}
Combine like terms in 49x-5x.