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0=9-Ix^{-1}z^{-2}
Variable I cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by I.
9-Ix^{-1}z^{-2}=0
Swap sides so that all variable terms are on the left hand side.
-Ix^{-1}z^{-2}=-9
Subtract 9 from both sides. Anything subtracted from zero gives its negation.
-z^{-2}\times \frac{1}{x}I=-9
Reorder the terms.
z^{-2}\times \frac{1}{x}I=\frac{-9}{-1}
Divide both sides by -1.
z^{-2}\times \frac{1}{x}I=9
Fraction \frac{-9}{-1} can be simplified to 9 by removing the negative sign from both the numerator and the denominator.
z^{-2}\times 1I=9x
Multiply both sides of the equation by x.
z^{-2}I=9x
Reorder the terms.
\frac{1}{z^{2}}I=9x
The equation is in standard form.
\frac{\frac{1}{z^{2}}Iz^{2}}{1}=\frac{9xz^{2}}{1}
Divide both sides by z^{-2}.
I=\frac{9xz^{2}}{1}
Dividing by z^{-2} undoes the multiplication by z^{-2}.
I=9xz^{2}
Divide 9x by z^{-2}.
I=9xz^{2}\text{, }I\neq 0
Variable I cannot be equal to 0.