x = \frac { \sum x } { n }
Solve for x (complex solution)
\left\{\begin{matrix}x=0\text{, }&n\neq 0\\x\in \mathrm{C}\text{, }&Σ=n\text{ and }n\neq 0\end{matrix}\right.
Solve for n
\left\{\begin{matrix}n=Σ\text{, }&Σ\neq 0\\n\neq 0\text{, }&x=0\end{matrix}\right.
Solve for x
\left\{\begin{matrix}x=0\text{, }&n\neq 0\\x\in \mathrm{R}\text{, }&Σ=n\text{ and }n\neq 0\end{matrix}\right.
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x-\frac{Σx}{n}=0
Subtract \frac{Σx}{n} from both sides.
\frac{xn}{n}-\frac{Σx}{n}=0
To add or subtract expressions, expand them to make their denominators the same. Multiply x times \frac{n}{n}.
\frac{xn-Σx}{n}=0
Since \frac{xn}{n} and \frac{Σx}{n} have the same denominator, subtract them by subtracting their numerators.
xn-Σx=0
Multiply both sides of the equation by n.
\left(n-Σ\right)x=0
Combine all terms containing x.
x=0
Divide 0 by n-Σ.
xn=Σx
Variable n cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by n.
xn=xΣ
The equation is in standard form.
\frac{xn}{x}=\frac{xΣ}{x}
Divide both sides by x.
n=\frac{xΣ}{x}
Dividing by x undoes the multiplication by x.
n=Σ
Divide Σx by x.
n=Σ\text{, }n\neq 0
Variable n cannot be equal to 0.
x-\frac{Σx}{n}=0
Subtract \frac{Σx}{n} from both sides.
\frac{xn}{n}-\frac{Σx}{n}=0
To add or subtract expressions, expand them to make their denominators the same. Multiply x times \frac{n}{n}.
\frac{xn-Σx}{n}=0
Since \frac{xn}{n} and \frac{Σx}{n} have the same denominator, subtract them by subtracting their numerators.
xn-Σx=0
Multiply both sides of the equation by n.
\left(n-Σ\right)x=0
Combine all terms containing x.
x=0
Divide 0 by n-Σ.
Examples
Quadratic equation
{ x } ^ { 2 } - 4 x - 5 = 0
Trigonometry
4 \sin \theta \cos \theta = 2 \sin \theta
Linear equation
y = 3x + 4
Arithmetic
699 * 533
Matrix
\left[ \begin{array} { l l } { 2 } & { 3 } \\ { 5 } & { 4 } \end{array} \right] \left[ \begin{array} { l l l } { 2 } & { 0 } & { 3 } \\ { -1 } & { 1 } & { 5 } \end{array} \right]
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
\lim _{x \rightarrow-3} \frac{x^{2}-9}{x^{2}+2 x-3}