Solve for x
x=\frac{2}{5}=0.4
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x=\frac{\frac{8}{5}}{4}
Divide both sides by 4.
x=\frac{8}{5\times 4}
Express \frac{\frac{8}{5}}{4} as a single fraction.
x=\frac{8}{20}
Multiply 5 and 4 to get 20.
x=\frac{2}{5}
Reduce the fraction \frac{8}{20} to lowest terms by extracting and canceling out 4.
Examples
Quadratic equation
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Linear equation
y = 3x + 4
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Matrix
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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
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Limits
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