Solve for C
C=-\frac{1}{r}
r\neq 0
Solve for r
r=-\frac{1}{C}
C\neq 0
Share
Copied to clipboard
C\left(-4\right)r=4
Subtract 7 from 3 to get -4.
\left(-4r\right)C=4
The equation is in standard form.
\frac{\left(-4r\right)C}{-4r}=\frac{4}{-4r}
Divide both sides by -4r.
C=\frac{4}{-4r}
Dividing by -4r undoes the multiplication by -4r.
C=-\frac{1}{r}
Divide 4 by -4r.
C\left(-4\right)r=4
Subtract 7 from 3 to get -4.
\left(-4C\right)r=4
The equation is in standard form.
\frac{\left(-4C\right)r}{-4C}=\frac{4}{-4C}
Divide both sides by -4C.
r=\frac{4}{-4C}
Dividing by -4C undoes the multiplication by -4C.
r=-\frac{1}{C}
Divide 4 by -4C.
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}