Solve for A
A=2\left(n+9\right)
Solve for n
n=\frac{A-18}{2}
Share
Copied to clipboard
3n+18-n=A
Use the distributive property to multiply 3 by n+6.
2n+18=A
Combine 3n and -n to get 2n.
A=2n+18
Swap sides so that all variable terms are on the left hand side.
3n+18-n=A
Use the distributive property to multiply 3 by n+6.
2n+18=A
Combine 3n and -n to get 2n.
2n=A-18
Subtract 18 from both sides.
\frac{2n}{2}=\frac{A-18}{2}
Divide both sides by 2.
n=\frac{A-18}{2}
Dividing by 2 undoes the multiplication by 2.
n=\frac{A}{2}-9
Divide A-18 by 2.
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}