Solve for x_2
x_{2}=\frac{x_{4}}{4}
Solve for x_4
x_{4}=4x_{2}
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4x_{2}=x_{4}
Swap sides so that all variable terms are on the left hand side.
\frac{4x_{2}}{4}=\frac{x_{4}}{4}
Divide both sides by 4.
x_{2}=\frac{x_{4}}{4}
Dividing by 4 undoes the multiplication by 4.
Examples
Quadratic equation
{ x } ^ { 2 } - 4 x - 5 = 0
Trigonometry
4 \sin \theta \cos \theta = 2 \sin \theta
Linear equation
y = 3x + 4
Arithmetic
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Matrix
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Simultaneous equation
\left. \begin{cases} { 8x+2y = 46 } \\ { 7x+3y = 47 } \end{cases} \right.
Differentiation
\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
\int _ { 0 } ^ { 1 } x e ^ { - x ^ { 2 } } d x
Limits
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