Solve for x_3
x_{3}=\frac{x+3}{4}
Solve for x
x=4x_{3}-3
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4x_{3}=x+3
Swap sides so that all variable terms are on the left hand side.
\frac{4x_{3}}{4}=\frac{x+3}{4}
Divide both sides by 4.
x_{3}=\frac{x+3}{4}
Dividing by 4 undoes the multiplication by 4.
x=4x_{3}-3
Subtract 3 from both sides.
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