Solve for j
j=\frac{R-k-9i}{9}
Solve for R
R=9j+k+9i
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k+9j+9i=R
Swap sides so that all variable terms are on the left hand side.
9j+9i=R-k
Subtract k from both sides.
9j=R-k-9i
Subtract 9i from both sides.
\frac{9j}{9}=\frac{R-k-9i}{9}
Divide both sides by 9.
j=\frac{R-k-9i}{9}
Dividing by 9 undoes the multiplication by 9.
j=\frac{R}{9}-\frac{k}{9}-i
Divide R-k-9i by 9.
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