Solve for x
x=\frac{x_{12}-4}{4}
Solve for x_12
x_{12}=4\left(x+1\right)
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4x=x_{12}-4
Subtract 4 from both sides.
\frac{4x}{4}=\frac{x_{12}-4}{4}
Divide both sides by 4.
x=\frac{x_{12}-4}{4}
Dividing by 4 undoes the multiplication by 4.
x=\frac{x_{12}}{4}-1
Divide x_{12}-4 by 4.
x_{12}=4x+4
Swap sides so that all variable terms are on the left hand side.
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