Solve for Q
Q=-\frac{1}{xy}
x\neq 0\text{ and }y\neq 0
Solve for x
x=-\frac{1}{Qy}
y\neq 0\text{ and }Q\neq 0
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Qyx=-\frac{\mathrm{d}}{\mathrm{d}x}(x)
Subtract \frac{\mathrm{d}}{\mathrm{d}x}(x) from both sides. Anything subtracted from zero gives its negation.
xyQ=-1
The equation is in standard form.
\frac{xyQ}{xy}=-\frac{1}{xy}
Divide both sides by yx.
Q=-\frac{1}{xy}
Dividing by yx undoes the multiplication by yx.
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