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Evaluate
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Differentiate w.r.t. y
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\frac{2y-y}{7}
Since \frac{2y}{7} and \frac{y}{7} have the same denominator, subtract them by subtracting their numerators.
\frac{y}{7}
Combine like terms in 2y-y.
\frac{\mathrm{d}}{\mathrm{d}y}(\frac{2y-y}{7})
Since \frac{2y}{7} and \frac{y}{7} have the same denominator, subtract them by subtracting their numerators.
\frac{\mathrm{d}}{\mathrm{d}y}(\frac{y}{7})
Combine like terms in 2y-y.
\frac{1}{7}y^{1-1}
The derivative of ax^{n} is nax^{n-1}.
\frac{1}{7}y^{0}
Subtract 1 from 1.
\frac{1}{7}\times 1
For any term t except 0, t^{0}=1.
\frac{1}{7}
For any term t, t\times 1=t and 1t=t.