Solve for x
x = \frac{21}{2} = 10\frac{1}{2} = 10.5
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\frac{2}{3}x+5=8+4
Calculate 2 to the power of 2 and get 4.
\frac{2}{3}x+5=12
Add 8 and 4 to get 12.
\frac{2}{3}x=12-5
Subtract 5 from both sides.
\frac{2}{3}x=7
Subtract 5 from 12 to get 7.
x=7\times \frac{3}{2}
Multiply both sides by \frac{3}{2}, the reciprocal of \frac{2}{3}.
x=\frac{7\times 3}{2}
Express 7\times \frac{3}{2} as a single fraction.
x=\frac{21}{2}
Multiply 7 and 3 to get 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}