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Solve for j
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t^{2}i-t^{2}j+k=r
Swap sides so that all variable terms are on the left hand side.
t^{2}i-t^{2}j=r-k
Subtract k from both sides.
-t^{2}j=r-k-t^{2}i
Subtract t^{2}i from both sides.
\left(-t^{2}\right)j=r-it^{2}-k
The equation is in standard form.
\frac{\left(-t^{2}\right)j}{-t^{2}}=\frac{r-it^{2}-k}{-t^{2}}
Divide both sides by -t^{2}.
j=\frac{r-it^{2}-k}{-t^{2}}
Dividing by -t^{2} undoes the multiplication by -t^{2}.
j=-\frac{r-it^{2}-k}{t^{2}}
Divide r-k-it^{2} by -t^{2}.