Solve for a
a=\frac{U_{R}-2b}{2}
Solve for U_R
U_{R}=2\left(a+b\right)
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2a+2b=U_{R}
Swap sides so that all variable terms are on the left hand side.
2a=U_{R}-2b
Subtract 2b from both sides.
\frac{2a}{2}=\frac{U_{R}-2b}{2}
Divide both sides by 2.
a=\frac{U_{R}-2b}{2}
Dividing by 2 undoes the multiplication by 2.
a=\frac{U_{R}}{2}-b
Divide U_{R}-2b by 2.
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