Solve for R_2
R_{2}=3-R_{1}
Solve for R_1
R_{1}=3-R_{2}
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3-R_{2}=R_{1}
Swap sides so that all variable terms are on the left hand side.
-R_{2}=R_{1}-3
Subtract 3 from both sides.
\frac{-R_{2}}{-1}=\frac{R_{1}-3}{-1}
Divide both sides by -1.
R_{2}=\frac{R_{1}-3}{-1}
Dividing by -1 undoes the multiplication by -1.
R_{2}=3-R_{1}
Divide R_{1}-3 by -1.
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