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Evaluate
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Differentiate w.r.t. x
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-7-2x-x
Add -9 and 2 to get -7.
-7-3x
Combine -2x and -x to get -3x.
\frac{\mathrm{d}}{\mathrm{d}x}(-7-2x-x)
Add -9 and 2 to get -7.
\frac{\mathrm{d}}{\mathrm{d}x}(-7-3x)
Combine -2x and -x to get -3x.
-3x^{1-1}
The derivative of a polynomial is the sum of the derivatives of its terms. The derivative of a constant term is 0. The derivative of ax^{n} is nax^{n-1}.
-3x^{0}
Subtract 1 from 1.
-3
For any term t except 0, t^{0}=1.