\sum \frac { 1 + 2 } { 3 } \times 2 = X
Solve for Σ
Σ=\frac{X}{2}
Solve for X
X=2Σ
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Σ\times \frac{3}{3}\times 2=X
Add 1 and 2 to get 3.
Σ\times 1\times 2=X
Divide 3 by 3 to get 1.
Σ\times 2=X
Reorder the terms.
2Σ=X
The equation is in standard form.
\frac{2Σ}{2}=\frac{X}{2}
Divide both sides by 2.
Σ=\frac{X}{2}
Dividing by 2 undoes the multiplication by 2.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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4 \sin \theta \cos \theta = 2 \sin \theta
Linear equation
y = 3x + 4
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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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