Solve for x
x=39
Graph
Share
Copied to clipboard
12720=200x+9600-120x
Use the distributive property to multiply 120 by 80-x.
12720=80x+9600
Combine 200x and -120x to get 80x.
80x+9600=12720
Swap sides so that all variable terms are on the left hand side.
80x=12720-9600
Subtract 9600 from both sides.
80x=3120
Subtract 9600 from 12720 to get 3120.
x=\frac{3120}{80}
Divide both sides by 80.
x=39
Divide 3120 by 80 to get 39.
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}