Solve for u
u = \frac{23}{21} = 1\frac{2}{21} \approx 1.095238095
Share
Copied to clipboard
3\times 3+7\times 2=21u
Variable u cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 21u, the least common multiple of 7u,3u.
9+14=21u
Do the multiplications.
23=21u
Add 9 and 14 to get 23.
21u=23
Swap sides so that all variable terms are on the left hand side.
u=\frac{23}{21}
Divide both sides by 21.
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}