Solve for x_23
x_{23}=\frac{x+30}{2}
Solve for x
x=2\left(x_{23}-15\right)
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2x_{23}=x+30
Swap sides so that all variable terms are on the left hand side.
\frac{2x_{23}}{2}=\frac{x+30}{2}
Divide both sides by 2.
x_{23}=\frac{x+30}{2}
Dividing by 2 undoes the multiplication by 2.
x_{23}=\frac{x}{2}+15
Divide x+30 by 2.
x=2x_{23}-30
Subtract 30 from both sides.
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