Solve for x
x=\frac{Z_{21}}{12}
Solve for Z_21
Z_{21}=12x
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12x=Z_{21}
Swap sides so that all variable terms are on the left hand side.
\frac{12x}{12}=\frac{Z_{21}}{12}
Divide both sides by 12.
x=\frac{Z_{21}}{12}
Dividing by 12 undoes the multiplication by 12.
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