Solve for y (complex solution)
\left\{\begin{matrix}\\y=\frac{7x}{9}\text{, }&\text{unconditionally}\\y\in \mathrm{C}\text{, }&x=0\end{matrix}\right.
Solve for y
\left\{\begin{matrix}\\y=\frac{7x}{9}\text{, }&\text{unconditionally}\\y\in \mathrm{R}\text{, }&x=0\end{matrix}\right.
Solve for x
x=\frac{9y}{7}
x=0
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-9xy=-7x^{2}
Subtract 7x^{2} from both sides. Anything subtracted from zero gives its negation.
\left(-9x\right)y=-7x^{2}
The equation is in standard form.
\frac{\left(-9x\right)y}{-9x}=-\frac{7x^{2}}{-9x}
Divide both sides by -9x.
y=-\frac{7x^{2}}{-9x}
Dividing by -9x undoes the multiplication by -9x.
y=\frac{7x}{9}
Divide -7x^{2} by -9x.
-9xy=-7x^{2}
Subtract 7x^{2} from both sides. Anything subtracted from zero gives its negation.
\left(-9x\right)y=-7x^{2}
The equation is in standard form.
\frac{\left(-9x\right)y}{-9x}=-\frac{7x^{2}}{-9x}
Divide both sides by -9x.
y=-\frac{7x^{2}}{-9x}
Dividing by -9x undoes the multiplication by -9x.
y=\frac{7x}{9}
Divide -7x^{2} by -9x.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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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}