Solve for x
x = \frac{6}{5} = 1\frac{1}{5} = 1.2
Graph
Share
Copied to clipboard
12x-3+8x=21
Combine 9x and 3x to get 12x.
20x-3=21
Combine 12x and 8x to get 20x.
20x=21+3
Add 3 to both sides.
20x=24
Add 21 and 3 to get 24.
x=\frac{24}{20}
Divide both sides by 20.
x=\frac{6}{5}
Reduce the fraction \frac{24}{20} to lowest terms by extracting and canceling out 4.
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}