Solve for a
a=-1
Solve for x
x\in \mathrm{R}
a=-1
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20a=\frac{\mathrm{d}}{\mathrm{d}x}(21)-20
Subtract 20 from both sides.
20a=-20
The equation is in standard form.
\frac{20a}{20}=-\frac{20}{20}
Divide both sides by 20.
a=-\frac{20}{20}
Dividing by 20 undoes the multiplication by 20.
a=-1
Divide -20 by 20.
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